[S-TT44] 最先端ベイズ統計学が拓く地震ビッグデータ解析

[STT44-04] Analysis of seismo-acoustic signals associated with the explosive activity of Popocatepetl volcano, Mexico

*Gerardo Manuel Mendo Perez¹、Alejandra Arciniega-Ceballos²、Robin S. Matoza³、Alejandro Rosado-Fuentes⁵、Richard W. Sanderson⁴、Hiromichi Nagao¹ (1.Earthquake Research Institute, University of Tokyo, Japan、2.Departamento de Vulcanologia, Instituto de Geofisica, UNAM, Mexico、3.Department of Earth Science and Earth Research Institute, UCSB, CA, USA、4.Icelandic Meteorological Office, Iceland、5.Posgrado en Ciencias de la Tierra, UNAM, Mexico)

キーワード：Seismo-acoustic, Template matching, Air-to-ground coupled waves

Popocatepetl is a 5,242 m high andesitic stratovolcano located in central Mexico. Its activity consists of persistent emissions of ashes and gases and explosions of different intensities. Here we present the results of the analysis of the infrasound and seismic signals associated with the eruptive activity of Popocatepetl volcano from May 2021 until June 2022. Popocatepetl activity was recorded by a temporal seismo-acoustic network (PO). The stations, each equipped with an infrasound sensor (IFS 3111 high-broadband Hyperion or Chaparral M60 UHP infrasound sensor) and a Trillium 120PA broadband seismometer, were installed in five different locations ranging 3–25 km from the vent. In our analysis, we included the signals of the PPIG station, a permanent seismic station, used for seismic and volcano surveillance, of the Servicio Sismologico Nacional, UNAM, Mexico, to our results. In order to identify the eruptive activity in the infrasound and seismic databases we used an automatic template matching procedure (ATMC). As initial templates for ATMC, we used the infrasound and air-to-ground coupled signals of the eruptive event occurred on 2021-09-26 (269 Julian day) 11:19:07 UTC time. In this work, we show the different types of events that ATMC detected, describe their temporal and spectral characteristics and the associated eruptive activity during the period of the study. We believe our results can be useful for hazard assessment.