[M-TT31] Brand-new scope of coupling geophysics being established by infrasound and associated waves

[MTT31-04] Comparison of seismic waveforms observed by microbarograph with broadband accelerometer

*Makiko Iwakuni¹, Takahiko Murayama¹, Nobuo Arai², Mie Ichihara³, Kazutaka Mannen⁴, Jerome M. Paros⁵, Takuma Oi⁶ (1.Japan Weather Association, 2.Disaster Mitigation Research Center, Nagoya University, 3.Earthquake Research Institute, University of Tokyo, 4.Hot Spring Research Institute of Kanagawa Prefecture, 5.Paroscientific, Inc. and Quartz Seismic Sensors, Inc., 6.Toho Mercantile co., Ltd.)

Keywords:Sensitive Microbarograph, Broadband Accelerometer, seismic response

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.