Villarrica
Bulletin of the Global Volcanism Network, Vol.46, Nr.3 (Marts 2021)
Managing Editor: Edward Genek.Added Door moving.Binnies.
Villarrica(Chili)Explosions, Aske Plumes, Crater Glow Sier and an active Lavasø in September 2020-Febrarari 2021
Quote this report as:
Global Volcanism Program, 2021. Rapport over Villarrica (Chile) (Bennis, K.L. en Venzke, E., ed.).Bulletin for Global Volcanism Network, 46: 3. Smithsonian Institution.https: //doi.org/10.5479/si.gvp.bgvn202103-357120
Villarrica
Chili
39,42 ° S, 71,93 ° W; Summit Elev.2847 m
Always his room (unless stated otherwise)
Villarrica, based in Chile, has had historic outbreaks that date from 1558. The current outbreak period started in December 2014 and was recently characterized by Topmarkt crater, Strombole Explosions and Asemissions (BGVN 45:09).The course from September 2020 to February 2021, which consists of an active lava -more, explosions, axis spots and crater -glow scene at night., part of Chiles National Service for Geology and Mining (Serviceio Nacional de Geología y Minería, Servageomin), Projecto Observación Villarrica Internet (POVI), part of Fundacion Volcanes de Chile, a private research group studying Volcan Center on Chili Aires Volcanic (VAAC) and various satellite data.
Activity In September 2020 was characterized by an active lava lake, white gas and steam spaces that rose 500 m above the crater, night intersection lens.deposited around the crater.Another explosion was recorded on 1829 in connection with another event for a long time that generated an aspkruimen at 450 m above the crater ".
| Figure 104.Explosions in Villarrica on 25 SPERN 2020 on 1350 (above) and 1829 (below) produced long -term secmic signal and Aspruim, which ranges 800 m and 450 m respectively and worked January January the permission of Sernageomin (Special Report of Volcanic. Activity (ReaV), La Araucania region and Los Rios, Volcan Villarrica, 25 September 2020, 14:35 Local time and 25 September 2020, 19:20 local time). |
| Figure 105.Gløde's Ejecta up to 100 m above the top of Villarrica was caught in POVI -Webcam in the night of 27 September 2020. With the permission of POVI. |
Intermittent white gas-and-dampers, Asexplosions and crater that glowed at night took place in October.On October 4, Sernageomin reported a long -term event accompanied by a moderate explosion at 1130 that generated an aspkruimen that 450 m above the crater and Ran Ne.The next day on 5 October, two events were recorded on 1343 and 1347 associated with explosions, which resulted in Ash Plum, which rose to 400 m above the crater and drifted (Figure 106)., October 12, a satellite image showed a ash space that operated 2.5 km NE and a strip of Tephra deposits of 200 m wide and 3 km long on the Ne -Flank, as a result of two eruption events on October 9, according to POVI and according to POVIand Sentinel-2 satellite images.
| Figure 106.Explosions in Villarrica on 5 October 2020, six microphone signal produced for a long time and an Asplume that rose 400 m over the crater and the permission of Snernanageomin (Special Report or Volcanica Activity (ReaV), region of Araucania and Los Rios, operated, VolcanVillarrica, October 5, 2020, 2:20 PM Local time). |
Moderate explosions were detected on 0534 and 0804 on October 15, which had long been associated with two earthquakes., according to Snernanageomin.20. October an explosion and long -term event of 1722 was registered, which resulted in an Aspruim 240 m above the crater that S operated (Figure 107).Crater, according to the VAAC report of a Buenos Aire and the Snannagomin.October 22, Tephra collapsed to 3.8 km on the E -Flank.
| Figure 107.An explosion in Villarrica on October 20, 2020 at 1 pm.1722 was for a long time characterized by an earthquake and a Dese in Araucania and Los Rios, Volcan Villarrica, October 20, 2020, 18:00 local time). |
Ashplosions took place in November, accompanied by intermittent crater-glowing Cens and white gas-and-steam.On November 5, a pulsas was observed on 1442, 350 m above the crater and floating NW-like activity was noticed on 6. November OM.0757 and 0808, when the axle rose above the crater and at 1412, then axle 250 mAbove the crater rose, both of which ran NW (Figure 108).was detected in satellite images up to 4.3 km height, Drift Ese.A differential absorption optical spectroscopy unit (Doas) showed average values of SO.2A total of 140 tonnes/day in the course of 7-8 and 15 November with a maximum daily value of 168 tons/day on November 7, November 7 m above the crater (Figure 108).On November 10, OVDAS reported that a spy of 320 m above the crater rose and SSW operated, accompanied by continuous seismic shaking at 1514. Ash continued to be reported in 16-17, respectively..Data from Doas showed that2The emissions had risen to an average of 166 tonnes/day in 16-30. November with a maximum daily value of 549 tons/day on November 22.
| Figure 108.Explosions that generated axis and glowing ejecta on top of Villarrica were captured by POVI-Webcam in 6-8 November 2020 (left right). |
The number of ash events fell in December compared to the previous months, although similar activities persist.With a moderate explosion by 1844 on December 5, with a resulting Ashplume that rose 160 m above the crater and Sse Dreef;Material was dropped off at SSE -de Flanken (Figure 109).Observed in the Lava -Lake.2The value was 178 tons/day with a maximum daily value of 353 tons/day on December 7, 2020, according to Doas data.
| Figure 109.An explosion in Villarrica on December 5, 2020 in 1844, extended six -term signal produced together with an Asplume that rose 160 m crater and SS.and Los Rios, Volcan Villarrica, December 5, 2020, 19:50 Local time). |
On December 16, on both 1146 and 1156, Ssernageomin reported two Cinderella associated with events for a long time.1716 still an ash space associated with a long time event 720 m above the crater and served Ese (Figure 110).Data obtained from Sentinel-2 and Skysat.Seismicity had risen in December 18-19, intense crater was visible and a remarkable sulfur scent was noticed, according to POVI reports.
| Figure 110.An explosion in Villarrica on December 17, 2020 on 1716 produced an Ashplume that rose and operated the 720 m Advote Crater., 17. |
In January 2021 the number of explosions with axle spots continued to fall compared to the previous months.2Plumes had risen compared to November and December to 318 tons/day with a maximum daily value of 789 tons/day on January 12.In the course of 1-15.Januari, the highest Ashplume 700 m rose over the crater, although usually composed of gas and steel emissions.value of2Plumes rose again to 430 tons/day with a maximum daily value of 789 tons/day on January 22.
| Figure 111.Webcam image of two glow holes in Villarrica on January 2, 2021. A bridge with solidified lava separates the two sections and extends over the active lavasø. |
The activity continued to fall in February compared to the previous months and consisted of mainly white gas and steaming whales, crater-glowing scene at night and then2to succeed.The 10 February touched dense white gas-and-vapor rumles 700 m above the crater.A of the course of 1-15 February, the average value of SO,2Plumes was 181 tons/day with a maximum daily value of 369 tons/day on 2 February.Crater that floats NW and 280 m, which have performed NE.In the course of 16-28 February, Witte Gas and Dampers rose at an altitude of 780 m above the crater;2Plumes was an average value of 402 tons/day with a maximum daily value of 1,026 tonnes/day on February 21.
Low -Impact Thermal activity was detected in September 2020 to January 2021 according to Mirova Log radiation graph using Modi's infrared satellite information (Figure 112).Tre Thermal Deviations were registered in September, one in October and four in November;was observed at the beginning of November.Satellite images in each month of the reporting period;
| Figure 112.Low-Power Thermal Deviations were detected in the Mirova graph (log radiation power) in Villarrica in September 2020 to the end of January 2021. A pulse of thermal deviations was registered at the end of December 2020 until the end of January 2021 compared to the previous month, but remainedLow in isttrøm. |
| Figure 113.Sentinel-2 Thermal satellite photos that shows strong thermal abnormalities on clear weather days on the Summit of Villarrica every month from September 2020 to February 2021. The strength of thermal anomalia in February fell somewhat compared to previous months.) Reproduction.Co -permit from Sentinel Hub Playground. |
Geological summary.The Villarrica Stratovolcano, in the Northern Merendict in Central Chile, is covered with glaciers, is located ~ 15 km south of the city of Pucon.3,500 years ago is located at the bottom of the currently active, dominant basalt and duck locations against the NW -Marge on a 6 km wide Pleistocene Calder.More than 30 Scoria cones and spraying are present on the Flanks.Pyroclastic currents that have been expanded up to 20 km from the volcano were produced under Holocene.And Lahars has damaged cities on his flanks.
Information contacts: National Geology and Mining Service (Sernageomin), Vulkanologisch Observatorium Van Andes del Sur (OVDAS), Avda Sta María Nr.0104, Santiago, Chile (URL: http://www.sernageomin.cl/);Villarrica Internet Observation Project (POVI)(Url: http://www.povi.cl/);Buenos Aires Volcanic Ash Advisory Center (VAAC), National Meteorological Service- Argentine Air Force, 25. Maj 658, Buenos Aires, Argentinië (URL: http://www.smn.gov.ar/vaac/buenosaires/inicio.php);Mirova (middle infrared observation of volcanic activity), a collaborative project between the universities of Turin and Florence (Italy) supported by the Center for Volcanic Risk for the Italian Civil Protection department (URL: http://www.mirovaweb.it/);Sentinel Hub Playground(Url: https://www.sentinel-hub.com/explore/sentinel-playground).
