Activity for the week of 3 April-9 April 2002
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.
| 19.514°N, 103.62°W
| Elevation 3850 m
As of 6 April volcanism continued at Colima and more small explosion earthquakes were recorded than during the previous week. Incandescent lava avalanches, generated from the fronts of block-lava flows, continued to travel 2-3 km down Colima's S, SW, and W flanks, and sporadically down the E flank. In addition, block-lava flows extended 550 m down the SW flank and 2 km down the W flank.
Source: Centro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima
| Sicily (Italy)
| 37.748°N, 14.999°E
| Elevation 3295 m
Ash emissions during 29 March-6 April at Etna's Bocca Nuova crater deposited ash as far as the town of Catania ~25 km SSE of the volcano. Ash emissions apparently stopped at Northeast Crater by 2 April; only steam was visible rising above the crater. During 4 and 5 April, earthquakes occurred at or near Etna with magnitudes up to 4.2.
Sources: Etna Volcan Sicilien (Charles Rivière), Italy's Volcanoes
| Eastern Kamchatka (Russia)
| 54.049°N, 159.443°E
| Elevation 1513 m
During 29 March-2 April, seismicity was above background levels at Karymsky. No seismic data have been available since 3 April due to seismic station malfunction. Faint thermal anomalies were visible on AVHRR satellite imagery on 30 and 31 March. No ash was visible on any satellite imagery. The last assigned Concern Color Code (until 2 April) was Yellow ("volcano is restless").
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
During 4-6 April, a remarkable series of deflation and inflation events occurred at Kilauea. Beginning on 4 April around 2100, Kilauea's summit deflated and 30 minutes later Pu`u `O`o followed. The summit deflated ~1.7 microradians and Pu`u` O`o dropped ~9 microradians. On 5 April rapid inflation began at 1600 at the summit and 12-13 minutes later at Pu`u` O`o. Inflation ended at the summit at 1700, when the summit abruptly deflated, and at Pu`u` O`o at 1800. Then, tilt at Pu`u` O`o oscillated three times between rapid deflation and slower inflation. After the tilt temporarily settled down, on 6 April at 0508 another oscillatory period commenced. Following 4.5 oscillations, tilt resumed slow, bumpy inflation after 1200 that same day.
During the period of deflation and inflation, long-period earthquakes increased at the summit, while tremor remained steady at Pu`u` O`o until it slightly increased on 6 April. Small surface lava flows were seen on the lower portion of Pulama pali and the upper part of the lava fan. During a brief trip to Pu`u` O`o on the morning of the 6th, scientists saw that the crater lake had risen ~8 m since 29 March (the lake surface was 17 m below the E rim), several cones were active, and lava was flowing into the lava lake from two vents. By the 7th activity had calmed down; tilt was relatively steady, volcanic tremor at Pu`u` O`o was at moderate levels, and tremor at the summit was at low-to-moderate levels. On the 8th there was activity at the rootless shields. Incandescence was not visible at Pu`u` O`o, which possibly means that lava lake activity was waning or had ended.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
| 19.023°N, 98.622°W
| Elevation 5393 m
During 3-9 April, Popocatépetl emitted small clouds of steam, gas, and generally minor amounts of ash. In addition, episodes of harmonic tremor were recorded. A moderate explosion on 8 April at 0438 produced an ash cloud to a height of ~7.6 km a.s.l. Incandescence was visible at the volcano during the eruption. A small ash cloud was visible on satellite imagery drifting to the E and by 1145 the cloud had drifted over the coast of México near the city of Veracruz.
Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC)
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
During 29 March-5 April, several gas-and-steam and ash-and-gas emissions occurred at Shiveluch. In addition, seismicity decreased in comparison to previous weeks, but remained above background levels. The highest rising ash-and-gas plume observed was produced from a short-lived explosive eruption on 30 March at 2042. Seismicity during the report period included earthquakes with magnitudes less than or equal to 2.1 at depths of 0-10 km, many local shallow seismic signals (from possible avalanches or weak gas-and-ash explosions), and episodes of weak intermittent volcanic tremor. Thermal anomalies were visible on satellite imagery, but ash was not. Shiveluch remained at Concern Color Code Yellow.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
| 16.72°N, 62.18°W
| Elevation 915 m
During 29 March-5 April, volcanism slightly decreased at Soufrière Hills in comparison to the previous week. Lava-dome growth over the entire summit region produced rockfalls that traveled predominately to the SE, E, and NE. Several pyroclastic flows traveled E ~2 km down the Tar River Valley, reaching the sea. At the beginning of the report week, ash from ongoing rockfalls and venting of the dome fell to the NW and N of Montserrat.
Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)
| 1.467°S, 78.442°W
| Elevation 5023 m
During 3-9 April, emissions of gas, steam, and ash continued at Tungurahua. A new period of tremor began at the volcano on 2 April. On 7 April gas-and-ash clouds were visible rising 1-2 km above the volcano and drifting mainly to the N. The same day around noon a lahar traveled N, blocking the Ambato-Baños route.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC), El Comercio
Weekly Reports Archive
||Huila, Nevado del
||Hunga Tonga-Hunga Ha'apai
||Soufriere St. Vincent
||South Sarigan Seamount
||Tair, Jebel at
|Campi Flegrei del Mar di Sicilia
|Chillan, Nevados de
||Palena Volcanic Group
||Kick 'em Jenny
|Dieng Volcanic Complex
||Rincon de la Vieja
|Etorofu-Yakeyama [Grozny Group]
||Lengai, Ol Doinyo
||Ruiz, Nevado del
|Fournaise, Piton de la
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