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Characteristics of the Seismic Waves From a New Experiment of Methane Gaseous Detonation Source in Tibet

Session: Recent Development in Ultra-Dense Seismic Arrays with Nodes and Distributed Acoustic Sensing [Poster]

Type: Poster

Date: 4/20/2021

Presentation Time: 04:15 PM Pacific

Description: 

More and more artificial seismic sources are applied for exploration of underground medium in recent years. Seismologists trend to develop environment friendly, green sources for the environmental protection. In this study, we introduce a new type of green active source with gaseous detonation of methane and oxygen. We conducted three different types of methane detonation experiments in Xietongmen County, Tibet at October 2020.The experiment site is more than an elevation of 5100 meters with lower air-pressure. The methane detonation signals were recorded by nearby 49 seismometers that along a profile of east-west direction. In current work, we analyzed the characteristics of methane detonation signals. The analysis of source signals suggest that it is effective and environmental artificial seismic source for high resolution near surface imaging. The P waves of methane detonation signals could be observed in the station that is 6.5km from the source. Dominant frequencies of source signals are 10-30Hz. We also identified fundamental mode surface waves in the nearby stations. Compared with traditional explosive sources, the methane source shows similar characteristics in time-frequency domain and duration time. The cross-correlation coefficients of methane source and traditional explosive source even could be greater than 0.75. In consideration of the damage to surrounding medium and emission of harmful gases of traditional explosive, the methane source is a promising artificial source in exploration of underground mediums.

Presenting Author: Zhanbo Ji

Student Presenter: No

Authors