[M-TT31] インフラサウンド及び関連波動が繋ぐ多圏融合地球物理学の新描像

[MTT31-04] 微気圧計と広帯域加速度計で同時観測された地震波形について

*岩國 真紀子¹、村山 貴彦¹、新井 伸夫²、市原 美恵³、萬年 一剛⁴、Jerome M. Paros⁵、大井 拓磨⁶ (1.一般財団法人　日本気象協会、2.名古屋大学減災連携研究センター、3.東京大学地震研究所、4.神奈川県温泉地学研究所、5.Paroscientific, Inc. および、 Quartz Seismic Sensors, Inc.、6.東邦マーカンタイル株式会社)

キーワード：微気圧計、広帯域加速度計、地震動応答

As already discussed in the papers, sensitive Microbarographs can detect seismic waves without going off the scale and supplemental measurements made with accelerometers.

Hakone volcanic activity increased from April 2015. To monitor Hakone volcanic activity, we started to measure seismic and pressure signals using a seismo-acoustic sensor that is a combination of a Broadband Accelerometer (Developed by Quartz Seismic Sensors, Inc., USA) and a Sensitive Microbarograph (Manufactured by Paroscientific, Inc., USA) in August. Both sensors use precise quartz crystal resonators to archive parts-per-billion resolution. The single axis accelerometer records the vertical component of ground accelerations.

Earthquake of Mj1.9 occurred at a depth of 2km in Hakone volcano area at 20:59:50 UTC on the 24th of September 2015, and its seismic signal was observed by both the microbarograph and accelerometer. The distance between the epicenter and the observation site is approximately 2.4 km. The microbarograph recorded similar waveforms to that of the accelerometer.

In this presentation, we discuss the similarities and differences of the seismic signals observed by the microbarograph and accelerometer.