Activity for the week of 30 December-5 January 2016
The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday, notices of volcanic activity posted on these pages are preliminary and subject to change as events are studied in more detail. This is not a comprehensive list of all of Earth's volcanoes erupting during the week, but rather a summary of activity at volcanoes that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed reports on various volcanoes are published monthly in the Bulletin of the Global Volcanism Network.
New Activity / Unrest
| Sicily (Italy)
| 37.748°N, 14.999°E
| Elevation 3295 m
INGV reported that after intense activity at Etna's Voragine Crater, Bocca Nuova, and the New Southeast Crater (NSEC) during the first 10 days of December, activity shifted to the Northeast Crater (NEC). During 9-10 December Strombolian activity was detected at NEC, with a few ejected incandescence bombs falling onto the outer flank and abundant ash emissions. Activity gradually diminished over a few days. On 13 December ash emissions rose from NSEC and on 18 December the Voragine Crater produced two brief ash emissions. Ash emissions began at 1100 on 28 December from a vent located high on the E flank of the NSEC cone. The emissions ceased in the afternoon; very minor and sporadic explosions continued from the same vent during the following days.
Source: Sezione di Catania - Osservatorio Etneo (INGV)
| 10.412°N, 123.132°E
| Elevation 2435 m
PHIVOLCS reported that at around 1230 on 30 Decemeber a low-energy explosion at Kanlaon, observed by residents in barangays Cabagnaan and Sag-ang in La Castellana (16 km SW), produced an ash plume that rose 100 m above the crater and slowly drifted SW. The Alert Level remained at 1 (on a scale of 0-5).
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Nevados de Chillan
| 36.868°S, 71.378°W
| Elevation 3180 m
Servicio Nacional de Geología and Minería (SERNAGEOMIN) Observatorio Volcanológico de Los Andes del Sur (OVDAS) reported that increasing seismicity at Nevados de Chillán and increased activity of the hydrothermal system prompted an Alert Level increase to Yellow, on a three-color scale. During 1-31 December the seismic network recorded 1,259 seismic events, including 186 volcano-tectonic events with a maximum local M (LM) of 1.8 located 17 km NNW at a depth of 4 km, 1,030 long-period earthquakes with a maximum LM 1.7, 40 short episodes of spasmodic tremor, and three tornillo-type events. The webcam recorded a small white plume rising from the crater on 9 December.
Source: Servicio Nacional de Geología y Minería (SERNAGEOMIN)
| Sulawesi (Indonesia)
| 1.112°N, 124.737°E
| Elevation 1785 m
PVMBG reported that during 28 December- 1 January white plumes rose 100 m above Soputan. Photos taken during 2-3 January showed that the plumes became denser and turned light gray, rising as high as 300 m. Thermal images revealed incandescence in Puncak Crater. Seismicity increased significantly on 4 January. At 1800 PVMBG raised the Alert Level to 3 (on a scale of 1-4). Residents and tourists were advised not to approach the craters within a radius of 4 km, or 6.5 km on the WSW flank. BNPB reported that at 2053 an explosion produced a dense gray ash plume that rose as high as 2 km and drifted SE. Lava flowed down the E flank and roaring was reported. Minor ashfall occurred in Langowan (8 km ENE).
Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Badan Nacional Penanggulangan Bencana (BNPB)
| Eastern Java (Indonesia)
| 7.942°S, 112.95°E
| Elevation 2329 m
Based on satellite and webcam images, the Darwin VAAC reported that during 30 December-5 January ash plumes from Tengger Caldera's Bromo cone rose to altitudes of 3.6-4.2 km (12,000-14,000 ft) a.s.l. and drifted 15-110 km in multiple directions.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Andaman Islands (India)
| 12.278°N, 93.858°E
| Elevation 354 m
Based on analysis of satellite imagery and wind data, the Darwin VAAC reported that during 3-4 January an ash plume from Barren Island rose to an altitude of 1.5 km (5,000 ft) a.s.l. and drifted almost 85 km SW.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| Kuril Islands (Russia)
| 46.532°N, 150.871°E
| Elevation 742 m
SVERT reported that satellite images detected a thermal anomaly over Snow, a volcano of Chirpoi, during 28-29 December and 2 January. The Aviation Color Code remained at Yellow.
Source: Sakhalin Volcanic Eruption Response Team (SVERT)
| 19.514°N, 103.62°W
| Elevation 3850 m
Based on satellite images, wind data, webcam images, and notices from the Mexico City MWO, the Washington VAAC reported that during 30 December-3 January and 5 January ash plumes from Colima rose to altitudes of 4.6-6.7 km (15,000-22,000 ft) a.s.l. and drifted NW, N, NE, and E.
Source: Washington Volcanic Ash Advisory Center (VAAC)
| Central Chile-Argentina border
| 37.856°S, 71.183°W
| Elevation 2953 m
Based on satellite and webcam views, the Buenos Aires VAAC reported that on 30 December diffuse gas and steam plumes possibly containing ash drifted SSE. The next day ash emissions drifted SW.
Source: Buenos Aires Volcanic Ash Advisory Center (VAAC)
| Halmahera (Indonesia)
| 1.693°N, 127.894°E
| Elevation 1229 m
Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 30 December-5 January ash plumes from Dukono rose to altitudes of 2.1-3.7 km (7,000-12,000 ft) a.s.l. and drifted 55-170 km in multiple directions.
Source: Darwin Volcanic Ash Advisory Centre (VAAC)
| 14.473°N, 90.88°W
| Elevation 3763 m
In a special report, INSIVUMEH reported a significant increase in activity at Fuego on 30 December. A series of pyroclastic flows descended the Las Lajas and El Jute drainages on the SE flank, and a dense ash plume rose 5 km and drifted 20 km W. Ashfall was reported in multiple communities on the flanks, including Panimache I and II (8 km SW), Morelia (9 km SW), and Santa Sofía (12 km SW). In another special report issued on 4 January, INSIVUMEH noted that dense ash plumes rose as high as 7 km and drifted over 40 km W, SW, S, and SE. Some explosions generated shock waves that vibrated nearby houses. Ash fell in Panimache I and II, Morelia, Santa Sofía, El Porvenir (8 km ENE), La Rochelle, and Osuna. Lava fountains rose 400-500 m above the crater and fed 2.5-km-long lava flows in the Santa Teresa (SW), Trinidad (S), and Las Lajas (SE) drainages. Collapses of parts of the cone generated pyroclastic flows that descended the Las Lajas, El Jute, and Trinidad drainages. By the next day activity had decreased; explosions produced ash plumes that rose 550 m and drifted 12 km S, SE, and SW. The lava flows were no longer active.
Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
KVERT reported that moderate explosive activity at Karymsky continued during 25 December-1 January. Satellite images detected an ash cloud, 56 km long and 6 km wide, drifting 145 km ENE on 25 December, and a thermal anomaly during 25, 27-28, and 31 December. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
HVO reported that seismicity beneath Kilauea's summit, upper East Rift Zone, and Southwest Rift Zone was at background levels during 30 December-5 January. The lava lake continued to circulate and spatter in the Overlook vent. On 2 January part of the E rim of the Overlook vent collapsed into the lava lake, triggering an explosion that ejected tephra onto the rim of the vent. At 0318 on 4 January another explosion occurred from the collapse of part of the N wall.
Webcams recorded multiple incandescent outgassing vents within Pu'u 'O'o Crater and high on the northeast rim. During 30 December-1 January a few small lava flows erupted from the vents, and on 4 January a small lava flow erupted from a vent on the NE side of the crater floor. The June 27th NE-trending lava flow continued to be active within 6 km NE of Pu'u 'O'o Crater, burning some areas of forest.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| 12.423°N, 86.539°W
| Elevation 1270 m
INETER reported that during 29-30 December no explosions at Momotombo were detected, though Real-time Seismic-Amplitude Measurements (RSAM) continued to be at moderate-to-high levels. Based on INETER and SINAPRED reports, three gas-and-ash explosions on 2 January, at 1333, 1426, and 1434, excavated the remaining parts of the lava dome which was emplaced about a month ago. An ash plume rose 500 m above the crater, drifted S and SW, and caused ashfall in Puerto Momotombo (9 km WSW). Possible ash plumes from an explosion at 2129 were hidden by darkness. At 0420 on 3 January an explosion ejected lava bombs 2 km away and caused ashfall in La Paz Centro (18 km SW). Lava flows had advanced as far as 2 km down the NE flank.
Sources: Instituto Nicaragüense de Estudios Territoriales (INETER), Sistema Nacional para la Prevención, Mitigación y Atención de Desastres (SINAPRED)
| 19.023°N, 98.622°W
| Elevation 5393 m
CENAPRED reported that during 29 December-5 January the seismic network at Popocatépetl recorded 4-92 daily emissions; 191 were detected on 3 January. As many as 11 explosions were detected daily and variable nighttime crater incandescence was observed. Explosions on 2 January ejected tephra onto the N flank, and a small steam, gas, and ash plume drifted E on 4 January. A seven-hour period of explosions started at 2246 on 4 January and ended at 0545 on 5 January. Six more explosions occurred in the evening. The Alert Level remained at Yellow, Phase Two.
Source: Centro Nacional de Prevencion de Desastres (CENAPRED)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
KVERT reported that during 25 December-1 January lava-dome extrusion onto Sheveluch’s N flank was accompanied by fumarolic activity, dome incandescence, ash explosions, and hot avalanches. A collapse from the W flank of the lava dome produced a hot avalanche, and an ash plume that rose 5.5 km (18,000 ft) a.s.l. and drifted 50 km SE. Satellite images detected a daily and intense thermal anomaly over the dome. The Aviation Color Code remained at Orange.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| 3.17°N, 98.392°E
| Elevation 2460 m
PVMBG reported that during 21-28 December inclement weather sometimes prevented visual observations of Sinabung and the growing lava dome in the summit crater. As many as 21 hot avalanches and pyroclastic flows traveled 0.7-1.5 km ESE, producing ash plumes that rose 1 km. Ash plumes from explosions rose as high as 3 km and drifted E and SW. Seismicity consisted of avalanche and pyroclastic-flow signals, low-frequency and hybrid events, tremor, tectonic events, and volcanic earthquakes. Seismicity fluctuated at high levels, although it had declined compared to the previous week, and indicated lava-dome growth. The Alert Level remained at 4 (on a scale of 1-4), indicating that people within 7 km of the volcano on the SSE sector, and within 6 km in the ESE sector, should evacuate.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Criteria & Disclaimers
The Weekly Volcanic Activity Report does not necessarily include all volcanic activity that occurred on Earth during the week. More than a dozen volcanoes globally have displayed more-or-less continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Moreover, Earth's sea-floor volcanism is seldom reported even though in theory it represents the single most prolific source of erupted material. The Weekly Volcanic Activity Report summarizes volcanic activity that meets one or more of the following criteria:
- A volcano observatory raises or lowers the alert level at the volcano.
- A volcanic ash advisory has been released by a volcanic ash advisory center (VAAC) stating that an ash cloud has been produced from the volcano.
- A verifiable news report of new activity or a change in activity at the volcano has been issued.
- Observers have reported a significant change in volcanic activity. Such activity can include, but is not restricted to, pyroclastic flows, lahars, lava flows, dome collapse, or increased unrest.
Volcanoes are included in the "New Activity/Unrest" section of the Weekly Volcanic Activity Report if the activity occurs after at least 3 months of quiescence. Once a volcano is included in the "New Activity/Unrest" section, updates will remain in that section unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Continuing Activity" section. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. This is commonly equal to Alert Level Orange on a scale of Green, Yellow, Orange, Red, where Red is the highest alert. Or alert level 3 on a scale of 1-4 or 1-5.
It is important to note that volcanic activity meeting one or more of these criteria may occur during the week, but may not be included in the Weekly Volcanic Activity Report because we did not receive a report.
1. The Weekly Volcanic Activity Report is intended to provide timely information about global volcanism on a weekly basis. Consequently, the report is generated rapidly by summarizing volcanic reports from various sources, with little time for fact checking. The accuracy of the Weekly Volcanic Activity Report is dependent upon the quality of the volcanic activity reports we receive. Reports published in the Bulletin of the Global Volcanism Network are monthly, and more carefully reviewed, although all of the volcanoes discussed in the Weekly Volcanic Activity Report are not necessarily reported in the Bulletin. Because of our emphasis on rapid reporting on the web we have avoided diacritical marks. Reports are updated on the Weekly Volcanic Activity Report web page as they are received, therefore information may be included regarding events that occurred before the current report period.
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