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.
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.
Medicine Lake Report. Twelve events were detected in the Medicine Lake area (~900 km NNW of the epicenter) in the 30 minutes after the M 7.5 earthquake. All had coda durations less than or equal to 10 seconds. The lack of any S-P separation indicated that they were centered very close to the single seismic station, near the center of the caldera. All known historical seismicity had occurred in the central caldera as part of a mainshock/aftershock sequence during the fall and winter of 1988-89.
Information Contacts: S. Walter and D. Hill, USGS Menlo Park.
The Global Volcanism Program has no Weekly Reports available for Medicine Lake.
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.
Earthquake swarm but no inflation
The quoted material is a report from Steve Walter. "On 29 September, 47 earthquakes were detected at Medicine Lake volcano, a large shield (50 km E of Mt. Shasta) that has experienced only 1 earthquake in the past eight years. The largest event (M 3.1) was located in the SW region of the caldera at a depth of 3.3 km (figure 1). Activity increased on 30 September when a total of 146 earthquakes were registered, 66 during a l-hour period. Four of these events (largest M 4.1) were located near the 29 September earthquake. After 30 September, seismicity declined to ~10 events/day until 4 October when there were 33 events, including a M 3.1 earthquake. Activity again declined with sporadic events (up to 5/day, M less than 2.0) continuing through 16 October. Most of the seismicity was recorded on the nearest instrument at Little Mt. Hoffman, ~4 km W of the epicentral zone. The next nearest stations are over 30 km from Medicine Lake in the Mt. Shasta network. On 3 October, a station was removed from the Mt. Shasta net and established at Medicine Mountain, ~1 km S of the epicentral zone on the S rim of the caldera. Although seismicity has declined, the USGS has selected six sites around the caldera for installation of one 3-component, low-gain, and six 1-component seismometers, scheduled for late October."
A levelling line, measured along the main caldera access road (figure 1) by Dan Dzurisin in August 1988, indicated at least 18 cm of deflation relative to a 1954 survey. Re-measurements of the same line in early October showed little or no additional deformation. Dzurisin and Phil Dawson attributed recent ground cracks, outside of the epicentral area and circumferential to Little Medicine Lake, as slumping possibly caused by the seismicity. No cracks were observed within the epicentral area, but recent tree falls were evident. Pre-existing weak fumarolic activity had not changed, although not all fumarolic areas were visited.
Information Contacts: S. Walter, USGS Menlo Park; D. Dzurisin, CVO.
Occasional seismicity; caldera subsides
"Seismicity... continued sporadically throughout October. As of 15 November, seismicity had declined to several locatable events/week. Most were of M less than 1 with the exception of a M 2 event on 29 October. The installation of a tightly spaced seismic network on 22 October permits even small events to be located. Three well-constrained earthquakes have been located since 29 October in the E, central, and S portions of Medicine Lake glass flow in the NW part of the caldera (figure 1). Depths of recent events are shallow, between 0.5 and 1.5 km. The locations of the recent events show a northward shift from those of the late September swarm. Seismologists are uncertain whether this shift is real or the result of improved locations from the new network."
A levelling line (~16 benchmarks spaced 1.5-2.25 km apart along the main caldera access road through the W, center, and SE portions of the caldera) was reoccupied on three occasions. Relative to a 1954 National Geodetic Survey, August 1988 measurements showed 175 ± 11 mm of central caldera subsidence with respect to the W and S rims, although subsidence extended outside the caldera. An October 1988 survey indicated 8 ± 5 mm of additional subsidence which is within 2-3 standard errors of noise levels. However, the shapes of the long- and short-term deformation curves are similar, with maximum subsidence occurring at the central caldera benchmark, suggesting to geologists that the deformation is real. The line will be relevelled in the spring when snow conditions permit.
Information Contacts: S. Walter, USGS Menlo Park; D. Dzurisin, CVO.
Small seismic swarm
Small events recorded late November-early December were attributed to freezing phenomena as winter came to N California. On 13 December at 2035, an M 1.9 earthquake, ~0.25 km SW of Medicine Lake glass flow, was recorded. During the next 75 minutes, nine events (M less than 1.9) were detected, followed by seven events on 14 December from 0121 to 0129. Seismicity was shallow (below 1 km) and had a high-frequency character. The 3-component station (LMD) is not currently operating.
Information Contacts: S. Walter, USGS Menlo Park.
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.
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.
Medicine Lake Report. Twelve events were detected in the Medicine Lake area (~900 km NNW of the epicenter) in the 30 minutes after the M 7.5 earthquake. All had coda durations less than or equal to 10 seconds. The lack of any S-P separation indicated that they were centered very close to the single seismic station, near the center of the caldera. All known historical seismicity had occurred in the central caldera as part of a mainshock/aftershock sequence during the fall and winter of 1988-89.
Information Contacts: S. Walter and D. Hill, USGS Menlo Park.
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.
Synonyms |
||||
Modoc-Medicine Lake Field | Medicine Lake Highland | ||||
Cones |
||||
Feature Name | Feature Type | Elevation | Latitude | Longitude |
Badger Peak | Cone | 2241 m | 41° 36' 0" N | 121° 38' 0" W |
Bearpaw Butte | Cone | 1628 m | 41° 43' 0" N | 121° 33' 0" W |
Big Sand Butte | Cone | 41° 42' 0" N | 121° 25' 0" W | |
Black Mountain | Cone | 2135 m | 41° 32' 0" N | 121° 29' 0" W |
Bonita Butte | Cone | 1526 m | 41° 44' 0" N | 121° 40' 0" W |
Border Mountain | Cone | 1912 m | 41° 30' 0" N | 121° 28' 0" W |
Buck Butte | Cone | 41° 28' 0" N | 121° 28' 0" W | |
Caldwell Butte | Cone | 1582 m | 41° 42' 0" N | 121° 29' 0" W |
Cinder Butte | Cone | 1885 m | 41° 41' 0" N | 121° 36' 0" W |
Cinder Cone | Pyroclastic cone | 1927 m | 41° 32' 0" N | 121° 39' 0" W |
Cougar Butte | Cone | 41° 39' 0" N | 121° 28' 0" W | |
Crescent Butte | Cone | 1524 m | 41° 43' 0" N | 121° 31' 0" W |
Doe Peak | Cone | 1875 m | 41° 30' 0" N | 121° 45' 0" W |
East Sand Butte | Cone | 41° 41' 0" N | 121° 23' 0" W | |
Fourmile Hill | Cone | 2153 m | 41° 39' 0" N | 121° 37' 0" W |
Hardin Butte | Cone | 1347 m | 41° 46' 0" N | 121° 32' 0" W |
Hippo Butte | Cone | 1674 m | 41° 43' 0" N | 121° 32' 0" W |
Indian Butte | Cone | 2078 m | 41° 38' 0" N | 121° 30' 0" W |
Little Mount Hoffman | Cone | 2235 m | 41° 35' 0" N | 121° 39' 0" W |
Little Sand Butte | Cone | 41° 40' 0" N | 121° 25' 0" W | |
Lookout Butte | Cone | 1969 m | 41° 39' 0" N | 121° 37' 0" W |
Lyons Peak | Cone | 2409 m | 41° 35' 0" N | 121° 30' 0" W |
Papoose Hill | Cone | 1792 m | 41° 30' 0" N | 121° 39' 0" W |
Powder Hill | Cone | 1744 m | 41° 29' 0" N | 121° 38' 0" W |
Pumice Stone Mountain | Cone | 2126 m | 41° 34' 0" N | 121° 43' 0" W |
Red Cap Mountain | Cone | 2146 m | 41° 33' 0" N | 121° 45' 0" W |
Red Hill | Cone | 1978 m | 41° 33' 0" N | 121° 39' 0" W |
Red Shale Butte | Cone | 2377 m | 41° 35' 0" N | 121° 32' 0" W |
Schonchin Butte | Pyroclastic cone | 1601 m | 41° 44' 0" N | 121° 32' 0" W |
Shotgun Peak | Cone | 2025 m | 41° 32' 0" N | 121° 33' 0" W |
Six Shooter Butte | Cone | 1945 m | 41° 31' 0" N | 121° 37' 0" W |
Snag Hill | Cone | 1727 m | 41° 28' 0" N | 121° 39' 0" W |
Three Sisters | Cone | 1614 m | 41° 43' 0" N | 121° 44' 0" W |
Whitney Butte | Cone | 1525 m | 41° 44' 0" N | 121° 35' 0" W |
Craters |
||||
Feature Name | Feature Type | Elevation | Latitude | Longitude |
Burnt Lava Flow | Crater - Cone | 41° 31' 0" N | 121° 32' 0" W | |
Deep Crater | Crater - Cone | 41° 27' 0" N | 121° 33' 0" W | |
Double Hole Crater | Crater | |||
Giant Crater | Crater | 1743 m | 41° 30' 0" N | 121° 38' 0" W |
High Hole Crater | Crater - Cone | 1885 m | 41° 31' 0" N | 121° 32' 0" W |
Mammoth Crater | Crater | 1615 m | 41° 42' 0" N | 121° 33' 0" W |
Paint Pot Crater | Crater | 1926 m | 41° 33' 0" N | 121° 42' 0" W |
Semi Crater | Crater | 1420 m | 41° 45' 0" N | 121° 32' 0" W |
Domes |
||||
Feature Name | Feature Type | Elevation | Latitude | Longitude |
Glass Mountain
Big Glass Mountain |
Dome | 2331 m | 41° 36' 0" N | 121° 30' 0" W |
Hoffman, Mount | Dome | 2412 m | 41° 37' 0" N | 121° 33' 0" W |
Little Glass Mountain
Stone Mountain |
Dome | 2089 m | 41° 34' 0" N | 121° 41' 0" W |
|
|
There is data available for 9 confirmed Holocene eruptive periods.
[ 1910 Jan ] Uncertain Eruption
Episode 1 | Eruption | East flank (Glass Mountain ?) | |||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1910 Jan - Unknown | Evidence from Unknown | |||||||||||||||||||||||||||||
List of 4 Events for Episode 1 at East flank (Glass Mountain ?)
|
1060 (?) Confirmed Eruption VEI: 3 (?)
Episode 1 | Eruption | Upper east flank (Glass Mountain) | |||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1060 (?) - Unknown | Evidence from Isotopic: 14C (calibrated) | |||||||||||||||||||||||||||||||||||||||
List of 6 Events for Episode 1 at Upper east flank (Glass Mountain)
|
1010 (?) Confirmed Eruption VEI: 3
Episode 1 | Eruption | SW flank (Little Glass Mountain) | |||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1010 (?) - Unknown | Evidence from Isotopic: 14C (calibrated) | |||||||||||||||||||||||||||||||||||||||||||||||||
List of 8 Events for Episode 1 at SW flank (Little Glass Mountain)
|
0840 (?) Confirmed Eruption
Episode 1 | Eruption | SW flank (Paint Pot Crater) | ||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0840 (?) - Unknown | Evidence from Isotopic: 14C (calibrated) | ||||||||||||||||||||||||
List of 3 Events for Episode 1 at SW flank (Paint Pot Crater)
|
0830 (?) Confirmed Eruption
Episode 1 | Eruption | North flank, Callahan lava flow | ||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0830 (?) - Unknown | Evidence from Isotopic: 14C (calibrated) | ||||||||||||||||||||||||
List of 3 Events for Episode 1 at North flank, Callahan lava flow
|
0780 (?) Confirmed Eruption
Episode 1 | Eruption | NE caldera rim (Mt. Hoffman area) | ||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0780 (?) - Unknown | Evidence from Isotopic: 14C (calibrated) | ||||||||||||||||||||||||
List of 3 Events for Episode 1 at NE caldera rim (Mt. Hoffman area)
|
1000 BCE (?) Confirmed Eruption
Episode 1 | Eruption | SE flank, Burnt Lava flow | |||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1000 BCE (?) - Unknown | Evidence from Isotopic: 14C (calibrated) | |||||||||||||||||||||||||||||
List of 4 Events for Episode 1 at SE flank, Burnt Lava flow
|
1130 BCE (?) Confirmed Eruption VEI: 0
Episode 1 | Eruption | Lower north flank (Black Crater) | |||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1130 BCE (?) - Unknown | Evidence from Isotopic: 14C (calibrated) | |||||||||||||||||||
List of 2 Events for Episode 1 at Lower north flank (Black Crater)
|
3090 BCE Confirmed Eruption
Episode 1 | Eruption | SE caldera rim | ||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
3090 BCE - Unknown | Evidence from Isotopic: 14C (calibrated) | ||||||||||||||||||||||||
List of 3 Events for Episode 1 at SE caldera rim
|
3190 BCE (?) Confirmed Eruption VEI: 0
Episode 1 | Eruption | NW caldera floor (Medicine Lake Glass flow) | ||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
3190 BCE (?) - Unknown | Evidence from Isotopic: 14C (calibrated) | ||||||||||||||||||||||||
List of 3 Events for Episode 1 at NW caldera floor (Medicine Lake Glass flow)
|
There is data available for 1 deformation periods. Expand each entry for additional details.
Reference List: Poland et al. 2006b.
Full References:
Poland, M., R. Bürgmann, D. Dzurisin, M. Lisowski, T. Masterlark, S. Owen, and J. Fink, 2006. Constraints on the mechanism of long-term, steady subsidence at Medicine Lake volcano, northern California, from GPS, leveling, and InSAR. J. Volcanol. Geotherm. Res., 150: 55-78. https://doi.org/10.1016/j.jvolgeores.2005.07.007
There is no Emissions History data available for Medicine Lake.
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.
The following 48 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 110060-1 | Rhyolitic Obsidian | BIG GLASS MOUNTAIN | -- |
NMNH 110060-2 | Rhyolitic Obsidian | BIG GLASS MOUNTAIN | -- |
NMNH 110060-3 | Rhyolitic Obsidian | BIG GLASS MOUNTAIN | -- |
NMNH 110060-4 | Obsidian | BIG GLASS MOUNTAIN | -- |
NMNH 110060-5 | Obsidian | BIG GLASS MOUNTAIN | -- |
NMNH 110060-6 | Rhyolitic Obsidian | BIG GLASS MOUNTAIN | -- |
NMNH 110060-7 | Rhyolitic Obsidian | BIG GLASS MOUNTAIN | -- |
NMNH 113026-1 | Basalt | -- | -- |
NMNH 113026-10 | Basalt | -- | -- |
NMNH 113026-11 | Basalt | -- | -- |
NMNH 113026-12 | Basalt | -- | -- |
NMNH 113026-13 | Basalt | -- | -- |
NMNH 113026-14 | Basalt | -- | -- |
NMNH 113026-15 | Basalt | -- | -- |
NMNH 113026-16 | Basalt | -- | -- |
NMNH 113026-17 | Basalt | -- | -- |
NMNH 113026-18 | Basalt | -- | -- |
NMNH 113026-19 | Basalt | -- | -- |
NMNH 113026-2 | Basalt | -- | -- |
NMNH 113026-20 | Basalt | -- | -- |
NMNH 113026-21 | Basalt | -- | -- |
NMNH 113026-22 | Basalt | -- | -- |
NMNH 113026-23 | Basalt | -- | -- |
NMNH 113026-24 | Basalt | -- | -- |
NMNH 113026-25 | Basalt | -- | -- |
NMNH 113026-26 | Basalt | -- | -- |
NMNH 113026-27 | Basalt | -- | -- |
NMNH 113026-28 | Basalt | -- | -- |
NMNH 113026-29 | Basalt | -- | -- |
NMNH 113026-3 | Basalt | -- | -- |
NMNH 113026-30 | Basalt | -- | -- |
NMNH 113026-31 | Basalt | -- | -- |
NMNH 113026-4 | Basalt | -- | -- |
NMNH 113026-5 | Basalt | -- | -- |
NMNH 113026-6 | Basalt | -- | -- |
NMNH 113026-7 | Basalt | -- | -- |
NMNH 113026-8 | Basalt | -- | -- |
NMNH 113026-9 | Basalt | -- | -- |
NMNH 115401-2 | Obsidian | GLASS MT | -- |
NMNH 115401-3 | Obsidian | GLASS MT | -- |
NMNH 115401-4 | Obsidian | GLASS MT | -- |
NMNH 115401-5 | Obsidian | GLASS MT | -- |
NMNH 115401-6 | Obsidian | GLASS MT | -- |
NMNH 116700-18 | Dacite | THREE SISTERS | -- |
NMNH 117460-36 | Obsidian | Hoffman flow; Hoffman, Mt. | -- |
NMNH 117460-37 | Obsidian | Hoffman flow; Hoffman, Mt. | -- |
NMNH 117460-38 | Obsidian | Hoffman, Mt. | -- |
NMNH 117460-39 | Obsidian | Hoffman, Mt. | -- |
Copernicus Browser | The Copernicus Browser replaced the Sentinel Hub Playground browser in 2023, to provide access to Earth observation archives from the Copernicus Data Space Ecosystem, the main distribution platform for data from the EU Copernicus missions. |
MIROVA | Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity. |
MODVOLC Thermal Alerts | Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales. |
WOVOdat
Single Volcano View Temporal Evolution of Unrest Side by Side Volcanoes |
WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
GVMID Data on Volcano Monitoring Infrastructure The Global Volcano Monitoring Infrastructure Database GVMID, is aimed at documenting and improving capabilities of volcano monitoring from the ground and space. GVMID should provide a snapshot and baseline view of the techniques and instrumentation that are in place at various volcanoes, which can be use by volcano observatories as reference to setup new monitoring system or improving networks at a specific volcano. These data will allow identification of what monitoring gaps exist, which can be then targeted by remote sensing infrastructure and future instrument deployments. |
Volcanic Hazard Maps | The IAVCEI Commission on Volcanic Hazards and Risk has a Volcanic Hazard Maps database designed to serve as a resource for hazard mappers (or other interested parties) to explore how common issues in hazard map development have been addressed at different volcanoes, in different countries, for different hazards, and for different intended audiences. In addition to the comprehensive, searchable Volcanic Hazard Maps Database, this website contains information about diversity of volcanic hazard maps, illustrated using examples from the database. This site is for educational purposes related to volcanic hazard maps. Hazard maps found on this website should not be used for emergency purposes. For the most recent, official hazard map for a particular volcano, please seek out the proper institutional authorities on the matter. |
IRIS seismic stations/networks | Incorporated Research Institutions for Seismology (IRIS) Data Services map showing the location of seismic stations from all available networks (permanent or temporary) within a radius of 0.18° (about 20 km at mid-latitudes) from the given location of Medicine Lake. Users can customize a variety of filters and options in the left panel. Note that if there are no stations are known the map will default to show the entire world with a "No data matched request" error notice. |
UNAVCO GPS/GNSS stations | Geodetic Data Services map from UNAVCO showing the location of GPS/GNSS stations from all available networks (permanent or temporary) within a radius of 20 km from the given location of Medicine Lake. Users can customize the data search based on station or network names, location, and time window. Requires Adobe Flash Player. |
DECADE Data | The DECADE portal, still in the developmental stage, serves as an example of the proposed interoperability between The Smithsonian Institution's Global Volcanism Program, the Mapping Gas Emissions (MaGa) Database, and the EarthChem Geochemical Portal. The Deep Earth Carbon Degassing (DECADE) initiative seeks to use new and established technologies to determine accurate global fluxes of volcanic CO2 to the atmosphere, but installing CO2 monitoring networks on 20 of the world's 150 most actively degassing volcanoes. The group uses related laboratory-based studies (direct gas sampling and analysis, melt inclusions) to provide new data for direct degassing of deep earth carbon to the atmosphere. |
Large Eruptions of Medicine Lake | Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA). |
EarthChem | EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS). |