← Back to Sessions

WITHDRAWN A Hybrid Earthquake Detection Method for Distributed Acoustic Sensing Array Data and Its Application to the 2022 Menyuan Earthquake Sequence

Description: 

WITHDRAWN Rapid response to destructive earthquakes is an important application of the distributed acoustic sensing technology (DAS), which can exploit existing telecom fiber-optic cables as ultra-dense DAS arrays. This technique significantly reduces deployment time and records large volume waveforms. However, the large stream of DAS data necessitates efficient earthquake detection methods. I propose a new DAS earthquake detection approach (ADE-HAT) that hybridizes the Array Beam Detection (ABD) and Template Matched Filter (TMF) methods. This approach is applied to detect aftershocks of the 2022 Menyuan Mw6.6 earthquake recorded by a linear DAS array with the dark fiber. The continuous DAS records are scanned by the ABD method first. During this process, if the energy of the ABD-detected event exceeds a specific threshold, the event is added to the template library, and the TMF is then used to re-scan the records within a designated time window. Compared to the ABD method, the ADE-HAT increases the detection rate from 69.4% to 89.4%, with a 41.4% increase in newly detected events. Notably, the magnitudes of 96.4% of these newly detected events are estimated to be below M2.0, indicating an enhanced monitoring capability. However, precise event locations remain challenging with the linear DAS array.

Session: Fiber-optic Sensing Applications in Seismology [Poster]

Type: Poster

Date: 4/15/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Gongbo

Student Presenter: Yes

Invited Presentation: 

Poster Number: 65

Authors