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Lassen Volcanic Center

Photo of this volcano
  • Country
  • Volcanic Region
  • Landform | Volc Type
  • Last Known Eruption
  • 40.492°N
  • 121.508°W

  • 3,187 m
    10,456 ft

  • 323080
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number


Most Recent Bulletin Report: June 1992 (BGVN 17:06) Citation IconCite this Report

Seismicity apparently triggered by M 7.5 earthquake hundreds of kilometers away

Southern California's largest earthquake since 1952, M 7.5 on 28 June, appeared to trigger seismicity at several volcanic centers in California. It was centered roughly 200 km E of Los Angeles. In the following, David Hill describes post-earthquake activity at Long Valley caldera, and Stephen Walter discusses the USGS's seismic network, and the changes it detected at Lassen, Shasta, Medicine Lake, and the Geysers.

In recent years, the USGS northern California seismic network has relied upon Real-Time Processors (RTPs) to detect, record, and locate earthquakes. However, a film recorder (develocorder) collects data from 18 stations in volcanic areas, primarily to detect long-period earthquakes missed by RTPs. The film recorders proved useful in counting the post-M 7.5 earthquakes, most of which were too small to trigger the RTPs.

The film record was scanned for the 24 hours after the M 7.5 earthquake, noting the average coda duration for each identified event. Some events may have been missed because of seismogram saturation by the M 7.5 earthquake. Marked increases in microseismicity were observed at Lassen Peak, Medicine Lake caldera, and the Geysers (table 1). No earthquakes were observed at Shasta, but the lack of operating stations on the volcano limited the capability to observe small events.

Table 1. Number of earthquakes at northern California volcanic centers during 24-hour periods following major earthquakes on 25 April (40.37°N, 124.32°W; M 7.0) and 28 June (34.18°N, 116.47°W; M 7.5) 1992. Events with coda durations less than or equal to 10 seconds and greater than 10 seconds are tallied separately. Earthquakes were identified from film records of seismograms from nearby stations. Courtesy of Stephen Walter.

Date Lassen Shasta Medicine Lake Geysers
Codas (seconds) <= 10 > 10 <= 10 > 10 <= 10 > 10 <= 10 > 10
25 Apr 1992 0 0 0 1 0 0 7 2
28 Jun 1992 8 14 1 5 12 0 46 4

Film was also scanned for the 24 hours following the M 7.0 earthquake at 40.37°N, 124.32°W (near Cape Mendocino) on 25 April. Although smaller than the 28 June earthquake, its epicenter was only 20-25% as far from the volcanoes. Furthermore, both the 25 April main shock and a M 6.5 aftershock were felt at the volcanic centers, but no felt reports were received from these areas after the 28 June earthquake. Only the Geysers showed any possible triggered events after the 25 April shock. However, background seismicity at the Geysers is higher than at the other centers, and is influenced by fluid injection and withdrawal associated with intensive geothermal development.

Lassen Report. Of the three major Holocene volcanoes in the California Cascades, Lassen (~800 km NNW of the epicenter) had the strongest response to the 28 June earthquake (figure 1). About 10 minutes after the S-wave's arrival and while surface waves were still being recorded, a M 2.8 event occurred south of Lassen Peak. Film records showed 9 more earthquakes in the first hour, and 22 events were identified during the first 24 hours. Although most were M 1 or smaller, at least two and perhaps as many as four were of magnitude greater than or equal to 2. Nine were detected by the RTP system. The best preliminary locations were concentrated ~3 km SW of Lassen Peak at

Figure (see Caption) Figure 1. Seismic events in the Lassen area that were apparently triggered by the M 7.5 southern California earthquake of 28 June 1992 (circles) compared to 1978-90 seismicity in the region (crosses). Squares mark seismic stations. Courtesy of S. Walter.

Information Contacts: Stephen Walter and David Hill, MS 977, U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 USA.

The Global Volcanism Program has no Weekly Reports available for Lassen Volcanic Center.

Bulletin Reports - Index

Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

06/1992 (BGVN 17:06) Seismicity apparently triggered by M 7.5 earthquake hundreds of kilometers away




Information is preliminary and subject to change. All times are local (unless otherwise noted)


June 1992 (BGVN 17:06) Citation IconCite this Report

Seismicity apparently triggered by M 7.5 earthquake hundreds of kilometers away

Southern California's largest earthquake since 1952, M 7.5 on 28 June, appeared to trigger seismicity at several volcanic centers in California. It was centered roughly 200 km E of Los Angeles. In the following, David Hill describes post-earthquake activity at Long Valley caldera, and Stephen Walter discusses the USGS's seismic network, and the changes it detected at Lassen, Shasta, Medicine Lake, and the Geysers.

In recent years, the USGS northern California seismic network has relied upon Real-Time Processors (RTPs) to detect, record, and locate earthquakes. However, a film recorder (develocorder) collects data from 18 stations in volcanic areas, primarily to detect long-period earthquakes missed by RTPs. The film recorders proved useful in counting the post-M 7.5 earthquakes, most of which were too small to trigger the RTPs.

The film record was scanned for the 24 hours after the M 7.5 earthquake, noting the average coda duration for each identified event. Some events may have been missed because of seismogram saturation by the M 7.5 earthquake. Marked increases in microseismicity were observed at Lassen Peak, Medicine Lake caldera, and the Geysers (table 1). No earthquakes were observed at Shasta, but the lack of operating stations on the volcano limited the capability to observe small events.

Table 1. Number of earthquakes at northern California volcanic centers during 24-hour periods following major earthquakes on 25 April (40.37°N, 124.32°W; M 7.0) and 28 June (34.18°N, 116.47°W; M 7.5) 1992. Events with coda durations less than or equal to 10 seconds and greater than 10 seconds are tallied separately. Earthquakes were identified from film records of seismograms from nearby stations. Courtesy of Stephen Walter.

Date Lassen Shasta Medicine Lake Geysers
Codas (seconds) <= 10 > 10 <= 10 > 10 <= 10 > 10 <= 10 > 10
25 Apr 1992 0 0 0 1 0 0 7 2
28 Jun 1992 8 14 1 5 12 0 46 4

Film was also scanned for the 24 hours following the M 7.0 earthquake at 40.37°N, 124.32°W (near Cape Mendocino) on 25 April. Although smaller than the 28 June earthquake, its epicenter was only 20-25% as far from the volcanoes. Furthermore, both the 25 April main shock and a M 6.5 aftershock were felt at the volcanic centers, but no felt reports were received from these areas after the 28 June earthquake. Only the Geysers showed any possible triggered events after the 25 April shock. However, background seismicity at the Geysers is higher than at the other centers, and is influenced by fluid injection and withdrawal associated with intensive geothermal development.

Lassen Report. Of the three major Holocene volcanoes in the California Cascades, Lassen (~800 km NNW of the epicenter) had the strongest response to the 28 June earthquake (figure 1). About 10 minutes after the S-wave's arrival and while surface waves were still being recorded, a M 2.8 event occurred south of Lassen Peak. Film records showed 9 more earthquakes in the first hour, and 22 events were identified during the first 24 hours. Although most were M 1 or smaller, at least two and perhaps as many as four were of magnitude greater than or equal to 2. Nine were detected by the RTP system. The best preliminary locations were concentrated ~3 km SW of Lassen Peak at

Figure (see Caption) Figure 1. Seismic events in the Lassen area that were apparently triggered by the M 7.5 southern California earthquake of 28 June 1992 (circles) compared to 1978-90 seismicity in the region (crosses). Squares mark seismic stations. Courtesy of S. Walter.

Information Contacts: Stephen Walter and David Hill, MS 977, U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 USA.

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Eruptive History

There is data available for 5 confirmed Holocene eruptive periods.

1914 May 30 - 1917 Jun 29 Confirmed Eruption VEI: 3

Episode 1 | Eruption Lassen Peak
1914 May 30 - 1917 Jun 29 Evidence from Observations: Reported

List of 14 Events for Episode 1 at Lassen Peak

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Phreatic activity
   - - - -    - - - - Directed Explosion
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Lava flow
   - - - -    - - - - Lava dome
   - - - -    - - - - Ash
   - - - -    - - - - Blocks
   - - - -    - - - - Pumice
   - - - -    - - - - Lahar or Mudflow
   - - - -    - - - - Property Damage
   - - - -    - - - - Evacuations
1914 May 30    - - - - VEI (Explosivity Index)
1915 May 22    - - - - VEI (Explosivity Index)

[ 1850 Aug - 1851 ] Discredited Eruption

1666 (?) Confirmed Eruption VEI: 3 (?)

Episode 1 | Eruption Cinder Cone
1666 (?) - Unknown Evidence from Sidereal: Dendrochronology

List of 6 Events for Episode 1 at Cinder Cone

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Lava flow
   - - - -    - - - - Cinder Cone
   - - - -    - - - - Ash
   - - - -    - - - - Bombs
1666
(?)
   - - - - VEI (Explosivity Index)

[ 1650 (?) ] Uncertain Eruption

Episode 1 | Eruption Chaos Crags
1650 (?) - Unknown Evidence from Unknown

List of 4 Events for Episode 1 at Chaos Crags

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Phreatic activity Uncertain
   - - - -    - - - - Lava dome Uncertain
   - - - -    - - - - Avalanche
   - - - -    - - - - Edifice Destroyed Collapse/avalanche

0980 ± 300 years Confirmed Eruption  

Episode 1 | Eruption Chaos Crags
0980 ± 300 years - Unknown Evidence from Isotopic: 14C (calibrated)

List of 6 Events for Episode 1 at Chaos Crags

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Lava dome
   - - - -    - - - - Ash
   - - - -    - - - - Lapilli
   - - - -    - - - - Pumice

0880 ± 300 years Confirmed Eruption  

Episode 1 | Eruption Chaos Crags
0880 ± 300 years - Unknown Evidence from Isotopic: 14C (calibrated)

List of 6 Events for Episode 1 at Chaos Crags

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Lava dome
   - - - -    - - - - Ash
   - - - -    - - - - Lapilli
   - - - -    - - - - Pumice

0800 ± 300 years Confirmed Eruption  

Episode 1 | Eruption Chaos Crags
0800 ± 300 years - Unknown Evidence from Isotopic: 14C (calibrated)

List of 6 Events for Episode 1 at Chaos Crags

Start Date End Date Event Type Event Remarks
   - - - -    - - - - Explosion
   - - - -    - - - - Pyroclastic flow
   - - - -    - - - - Lava dome
   - - - -    - - - - Ash
   - - - -    - - - - Lapilli
   - - - -    - - - - Pumice
Deformation History

There is data available for 1 deformation periods. Expand each entry for additional details.


Deformation during 1996 - 2000 [Subsidence; Observed by InSAR]

Start Date: 1996 Stop Date: 2000 Direction: Subsidence Method: InSAR
Magnitude: Unknown Spatial Extent: 40.00 km Latitude: Unknown Longitude: Unknown

Remarks: Deformation area centered 5 km SE of Lassen Peak


Reference List: Poland et al. 2004b.

Full References:

Poland, M., G. Bawden, M. Lisowski, and D. Dzurisin, 2004. Newly discovered subsidence at Lassen Peak, southern Cascade Range, California, from InSAR and GPS. Eos Trans. AGU, 85(47), Fall Meet. Suppl., Abstract G51A-0068.

Emission History

There is no Emissions History data available for Lassen Volcanic Center.

Photo Gallery

The blocky surface of Chaos Jumbles in the foreground was produced by collapse of a portion of the Chaos Crags lava dome complex in the background about 1650 CE. The cold rock avalanche traveled 5 km from its source, and may have occurred in the absence of any eruptive activity. Three successive lobes of the avalanche cover an area of 8 km2.

Photo by Lee Siebert, 1982 (Smithsonian Institution).
The tree stump and strip of red bark fragments in the foreground are the remnants of one of the many trees blown down radially away from the volcano by a pyroclastic surge on May 22, 1915, during the paroxysmal phase of the 1914-1917 eruption of Lassen Peak. The Devastated Area in the background remained sparsely vegetated for many decades following the eruption.

Photo by Lee Siebert, 1982 (Smithsonian Institution).
The trunks of the large ponderosa pine tree at the left and the smaller birch to the right in the Lost Creek valley NE of Lassen Peak were bent over by a mudflow from an eruption in May 1915. After the eruption vertical growth of the trees resumed. The mudflows traveled 50 km from the volcano, destroying bridges, farmlands, and farm buildings.

Photo by Lee Siebert, 1982 (Smithsonian Institution).
Bumpass Hell, the largest hydrothermal area at Lassen volcano, located south of Lassen Peak, contains steaming fumaroles and mudpots. It was named after its discoverer, a noted hunter and mountain man who suffered severe burns when he broke through the thin crust of the thermal area.

Copyrighted photo by Katia and Maurice Krafft, 1989.
Chaos Jumbles, a debris avalanche-deposit formed by collapse of Chaos Crags about 1650 CE, is seen from the top of the avalanche scarp. The avalanche traveled up to 5 km in three lobes now covered with varying degrees of vegetation. The avalanche was emplaced as a cold rockfall avalanche; there is no direct evidence for an associated explosive eruption.

Photo by Lee Siebert, 1982 (Smithsonian Institution).
The massive dacitic lava dome of Lassen Peak rises above Lake Helen on the south side of the volcano. Plugs of dark dacitic lava exposed near the summit are surrounded by vast aprons of lighter-colored talus associated with growth of the lava dome.

Photo by Lee Siebert, 1972 (Smithsonian Institution).
Hikers perch on a small pinnacle of dacitic lava that forms the high point of Lassen Peak, the southernmost major volcano in the Cascade Range that stretches from southern British Columbia to northern California. Lassen Peak is a large dacitic lava dome that last erupted from 1914 to 1917.

Photo by Lee Siebert, 1968 (Smithsonian Institution).
An aerial view of cloud-capped Lassen Peak from the NW shows the Chaos Crags lava dome complex on its left, the source of rockfall avalanche in 1650 CE, and the older Brokeoff stratovolcano and post-caldera lava domes on the right. Lassen Peak was the source of California's latest eruption, that lasted from 1914 to 1917.

Photo by Lyn Topinka, 1984 (U.S. Geological Survey).
The sparsely vegetated Devastated Zone on the NE flank of Lassen Peak was swept by a pyroclastic surge on May 22, 1915, during the paroxysmal phase of the 1914-1917 eruption. The pyroclastic surge destroyed forests, and was accompanied by mudflows that traveled down Lost Creek and Hat Creek valleys.

Photo by Lyn Topinka, 1984 (U.S. Geological Survey).
U.S. Geological Survey volcanologists conduct Electronic Distance Measurement surveys NW of Lassen Peak as part of a monitoring program at Lassen volcano. Chaos Crags lava dome rises in the background. The large scarp at the left was formed during collapse of part of Chaos Crags about 1650 CE.

Photo by Lyn Topinka, 1984 (U.S. Geological Survey).
Lassen Peak, rising above Manzanita Lake on the NW, is the focal point of the Lassen volcanic center, a concentration of volcanic features covering much of Lassen National Park. The massive lava dome forming Lassen Peak was constructed about 25,000 years ago and was the site of California's most recent eruption during 1914-1917. Chaos Crags, a lava dome complex on the north flank, and the aptly named Cinder Cone to the NE, have also erupted within the past 1200 years.

Photo by Dave Wieprecht, 1995 (U.S. Geological Survey).
Lassen Peak rises in the background behind the Chaos Crags, a group of dacitic lava domes on Lassen's north flank. The Chaos Crags were formed during a series of eruptions about 1100 to 1000 years ago in which early explosive eruptions and pyroclastic flows were followed by growth of a complex of five lava domes. The area of light-colored talus on the right side is the source of a large debris avalanche from Chaos Crags about 1650 CE.

Photo by Dan Dzurisin, 1982 (U.S. Geological Survey).
Chaos Crags in the foreground and Lassen Peak in the background are large lava dome complexes in the southern Cascade Range. Chaos Crags consists of a group of six overlapping rhyodacite lava domes that erupted around 1,100 years ago. Lassen last erupted during 1914-17.

Photo by Dan Dzurisin, 1982 (U.S. Geological Survey).
The Chaos Crags lava dome complex on the north flank of Lassen Peak, seen here from the south, was formed at the end of an eruptive period about 1100-1000 years ago. A tephra ring from associated explosive eruptions forms the light-colroed area at the middle right.

Photo by Dan Dzurisin, 1981 (U.S. Geological Survey).
The Devastated Area swept by pyroclastic surges during an explosion on May 22, 1915 is seen here from the NE flank of Lassen Peak. The May 22 produced an eruption plume as high as 9 km, a pyroclastic surge that swept the area seen here, and a series of three lahars, the two largest of which swept down Lost Creek to the NE. The area as far as the distant flank of forested Raker Peak at the upper left was affected by the May 22 pyroclastic surge. Revegetation has begun to cover the distal parts of the May 1915 deposits.

Photo by Bill Chadwick, 1981 (U.S. Geological Survey).
Lassen Peak, seen from Brokeoff volcano to the SW, is one of a series of dacitic lava domes erupted during the past 25,000 years along the northern edge of a caldera on the northern flank of Brokeoff volcano. Lassen Peak is the largest and most recently active of these domes.

Photo by Bill Chadwick, 1981 (U.S. Geological Survey).
The summit of Lassen Peak contains a lava flow and several craters that formed during the 1914-1917 eruption. Lava flowed out of the crater through low points in the eastern and western crater rims. The NW crater in the foreground (right) formed during explosions near the end of the eruption in 1917.

Photo by Bill Chadwick, 1981 (U.S. Geological Survey).
In May 1915, a year after the start of the eruption, lava flowed through low points in the eastern and western crater rims and descended the upper flanks. The western flow shown in this photo reached about 500 m down the flank. On 19-20 May 1915 the eastern flow fragmented and mixed with snowmelt, forming a debris flow that traveled 35 km down Lost Creek and Hat Creek valleys, destroying bridges and farm buildings.

Photo by Bill Chadwick, 1981 (U.S. Geological Survey).
Potato Butte, the forested cinder cone at the left-center, is seen here from the rim of the Hat Creek vent with snow-covered Lassen Peak in the background. The Potato Butte cinder cones and lava flows were erupted around 65,000-75,000 years ago. The prominent 30,000-year-old Hat Creek lava flow traveled nearly 30 km from a fissure vent near the town of Old Station. An undated, but younger-looking flow originated from a cinder cone near West Prospect Peak, west of Potato Butte.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
The green Manzanita-covered slope in the foreground is part of the circular rim of South Potato Butte, one of two cinder cones forming Potato Butte. The two cinder cones fed youthful-looking lava flows down the Hat Creek graben. Snow-covered Lassen Peak rises in the distance, with the Chaos Crags lava dome complex to its right.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
Snow-capped Lassen Peak is seen here from the summit of Prospect Peak shield volcano at the NE end of Lassen Volcanic National Park. The unvegetated, largely snow-free peaks on the right horizon are the Chaos Crags, a complex of dacitic lava domes last active about 1100 years ago. The Twin Lakes sequence of andesitic lava shields and cones forms the lake-studded area of the Central Plateau in the center of the photo.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
The aptly named Cinder Cone, a symmetrical pyroclastic cone at the NE end of the Lassen volcanic center, is seen here from the NE across Butte Lake. The unvegetated lava flow at the left originated from the cone. Although there is a report of an eruption from Cinder Cone in 1850 CE, recent work suggests that the cone and associated lava flows all formed during a brief eruptive interval lasting at most a few decades about 230-425 radiocarbon years ago. Lava flows traveled to the NE and SE, forming Snag Lake and Butte Lake.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
Butte Lake in NE Lassen Volcanic National Park was formed when the blocky lava flow seen across the lake dammed local drainages. The flow was one of five accompanying the eruption that formed Cinder Cone several hundred years ago. This marks the NW-most extent of lava flows from Cinder Cone.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
The unvegetated pyroclastic cone in the foreground, seen from near the summit of Prospect Peak, is Cinder Cone in NE Lassen Volcanic National Park. Cinder Cone, which was formed during an eruption several hundred years ago, was the source of an extensive series of lava flows that can be seen on the far side of the cone. The flows dammed up local drainages, forming two lakes, one of which is Snag Lake, seen here SSE of the cone.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
Lava flows traveled about 3.5 km to the north and south from Cinder Cone, blocking drainages and forming two lakes. The northern lake, Butte Lake, is seen here from the summit of Cinder Cone. The quartz-bearing basaltic lava flows originated from vents at the SE flank of the pyroclastic cone. The old Emigrant Trail connecting Nevada with the Sacremento Valley winds through the trees at the left base of the cone.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
A series of lava flows from a vent on the SE flank of Cinder Cone traveled about 3.5 km to the north and south. Snag Lake, seen here to the south from the summit of Cinder Cone, was formed with the lava flow dammed up drainages. The colorful area at the lower left, known as the Painted Dunes, is an ash deposit oxidized by the heat of a still-hot underlying lava flow. The dark-colored main flow beyond the Painted Dunes was emplaced later during the same eruption, and is ash free.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
The summit of Cinder Cone contains nested craters with several crater rims created as a result of changes in vent location and eruption intensity. The scoria cone was formed during eruptions several hundred years ago in NE Lassen Volcanic National Park. Prospect Peak, an andesitic shield volcano capped by a small pyroclastic cone, is the forested peak in the background NW of Cinder Cone.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
The colorful Painted Dunes at Cinder Cone in NE Lassen Volcanic National Park were formed when ash deposits from Cinder Cone were oxidized by a still-hot underlying lava flow. The mounded surface of the ash reflects the irregular topography of the underlying Painted Dunes lava flow. A black ash-free lava flow, also erupted from Cinder Cone at a later date during the same eruption, can be seen at the top of the photo.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
A roughly 3-m-high rounded glacial erratic at the Bumpass Hell parking lot is witness to the extensive glacial erosion that has affected much of Lassen Volcanic National Park. Brokeoff volcano in the background is the glacially eroded remnant of a large stratovolcano that formed begining about 600,000 years ago. At its peak the volcano may have reached a height of 3350 m. Glacial erosion of hydrothermally altered rocks at the core of the volcano has produced a large central depression.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
This view from Prospect Peak shows perhaps the youngest lava flow immediately north of the Lassen volcanic center. This sparsely vegetated flow originated from a small cinder cone (left-center) between Prospect and West Prospect (upper left) peaks, two young basaltic lava cones straddling the NE border of Lassen Volcanic National Park. The young, but undated andesitic flow traveled initially to the NE and then around the flank of West Prospect Peak to the NW.

Photo by Lee Siebert, 1998 (Smithsonian Institution).
GVP Map Holdings

Maps are not currently available due to technical issues.

The maps shown below have been scanned from the GVP map archives and include the volcano on this page. Clicking on the small images will load the full 300 dpi map. Very small-scale maps (such as world maps) are not included.

Smithsonian Sample Collections Database

The following 58 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections, and may be availble for research (contact the Rock and Ore Collections Manager). Catalog number links will open a window with more information.

Catalog Number Sample Description Lava Source Collection Date
NMNH 111123-101 Quartz Basalt CINDER CONE --
NMNH 111123-101 Quartz Basalt -- --
NMNH 111123-1242 Basalt -- --
NMNH 111123-1426 Dacite -- --
NMNH 111123-1449 Quartz Basalt CINDER CONE --
NMNH 111123-791 Quartz Basalt LASSEN PEAK --
NMNH 111123-792 Quartz Basalt LASSEN PEAK --
NMNH 111123-793 Pumice LASSEN PEAK --
NMNH 111123-794 Quartz Basalt LASSEN PEAK --
NMNH 111123-795 Quartz Basalt LASSEN PEAK --
NMNH 111123-796 Quartz Basalt LASSEN PEAK --
NMNH 111123-82 Dacite -- --
NMNH 111123-82 Dacite -- --
NMNH 111123-95 Tuffaceous Sand -- --
NMNH 111123-95 Volcanic Sand CINDER CONE --
NMNH 111123-96 Tephra CINDER CONE --
NMNH 112407 Andesite-Dacite LASSEN PEAK 1 Jan 1970
NMNH 113619-4 Gypsum -- --
NMNH 113619-5 Mirabilite -- --
NMNH 113619-6 Volcanic Ash -- --
NMNH 113619-7 Sulfur -- --
NMNH 114901 Volcanic Dust -- --
NMNH 115559-1 Andesite-Dacite LASSEN PEAK --
NMNH 115559-2 Andesite-Dacite LASSEN PEAK --
NMNH 116137-1 Pumice -- --
NMNH 116137-2 Dacite -- --
NMNH 116137-3 Banded Dacite -- --
NMNH 116465 Andesite-Dacite -- 4 Jun 1905
NMNH 2072 Quartz Basalt CINDER CONE --
NMNH 22923 Volcanic Cinder -- --
NMNH 22926 Basalt -- --
NMNH 38364 Perlite -- --
NMNH 38604 Quartz Basalt CINDER CONE --
NMNH 70589 Quartz Basalt CINDER CONE --
NMNH 70597 Dacite CINDER CONE --
NMNH 70598 Quartz Basalt CINDER CONE --
NMNH 91416 Dacite -- --
NMNH 91417 Dacite -- --
NMNH 91419 Dacite -- --
NMNH 91420 Dacite -- --
NMNH 91421 Dacite -- --
NMNH 91422 Dacite Volcanic Breccia -- --
NMNH 91425 Dacite -- --
NMNH 91426 Lava -- --
NMNH 91430 Volcanically Scorched Pine Needles -- --
NMNH 91431 Volcanic Dust -- --
NMNH 91433-1 Dacite -- --
NMNH 91433-10 Basalt -- --
NMNH 91433-11 Hornblende Andesite -- --
NMNH 91433-12 Alunite -- --
NMNH 91433-2 Dacite -- --
NMNH 91433-3 Dacite -- --
NMNH 91433-4 Dacite -- --
NMNH 91433-5 Rhyolite Glass -- --
NMNH 91433-6 Rhyolite -- --
NMNH 91433-7 Andesite -- --
NMNH 91433-8 Andesite -- --
NMNH 91433-9 Alunite Rock -- --
External Sites