Sangay volcano (Ecuador): the opening of two new vents, a drumbeat seismic sequence and a new lava flow in late 2021

IF 2.5 Q2 Earth and Planetary Sciences

Volcanica Pub Date : 2022-10-14 DOI:10.30909/vol.05.02.295311

S. Hidalgo, F. Vasconez, J. Battaglia, B. Bernard, P. Espín, S. Valade, María-Fernanda Naranjo, R. Campion, J. Salgado, Marco Córdova, M. Almeida, S. Hernández, Gerardo Pino, E. Gaunt, A. Bell, P. Mothes, M. Ruiz

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引用次数: 1

Abstract

On 2 December, 2021 we recorded a sequence of drumbeat seismic events at Sangay volcano. This sequence lasted several hours and resulted in two explosive emissions whose eruptive columns reached 9 km above crater. Unexpectedly, these explosions did not produce any ash fallout in the inhabited areas around the volcano. This drumbeat sequence was produced after a series of morphological changes, including the opening of two new vents (W and N) and a landslide. These occurred during an enhanced period of ground deformation and degassing. Further analysis of satellite images allowed us to determine that this sequence was associated with the widening of the recently open vent north of the main crater, and the extrusion of a new lava flow. Timely communication of this event to the authorities and the population was ensured by the IG-EPN by following internal protocols. The corresponding short reports reached more than 300,000 people.

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桑盖火山(厄瓜多尔):2021年底，两个新喷口开放，一个鼓状地震序列和一个新的熔岩流

2021年12月2日，我们在桑盖火山记录了一系列鼓点地震事件。这一序列持续了几个小时，产生了两次爆炸物，其喷发柱高达火山口上方9公里。出乎意料的是，这些爆炸并没有在火山周围的居民区产生任何火山灰沉降物。这个鼓点序列是在一系列形态变化后产生的，包括两个新的喷口（W和N）的打开和一次滑坡。这些情况发生在地面变形和脱气增强的时期。对卫星图像的进一步分析使我们能够确定，这一序列与主火山口以北最近开放的喷口加宽以及新熔岩流的挤压有关。IG-EPN通过遵循内部协议，确保及时向当局和民众传达这一事件。相应的简短报告覆盖了30多万人。

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