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A Reference Marsquake Catalogue

Description: 

NASA’s InSight seismometer operated on Mars from 12.2018 - 12.2022. Since the mission is complete, the Marsquake Service (MQS) is preparing a final reference catalogue encompassing seismicity recorded across the entire mission. The analysis of marsquake is challenging, given the availability of only a single station, low magnitudes events with large epicentral distances, and strongly varying background noise. These factors collectively result in low event signal-to-noise ratios (SNR). Our reference catalogue heavily leverages a deep learning denoising approach to mitigate the noise contamination. We show that denoising performs comparably to fine-tuned bandpass filtering at high SNRs, and clearly outperforms it at low SNRs, with respect to accurate waveform and amplitude retrieval, as well as onset picking.

We produce a denoised waveform data set for all >1300 events in the MQS v14 catalogue. For the HF event family, we apply automated phase picking for the first time. For the LF family, consisting of around 100 events, we review each event, improving the event characterisation and location by new or updated phase picks and polarisation.

We find many new features that were missing in earlier catalogues. We find aftershocks and demonstrate that several complicated LF event waveforms can be explained by marsquake doublets – two similar strong quakes from similar locations that produce overlapping waveforms – that locate in Cerberus Fossae. In addition, we show that the unusual sequence on Sol 1157 consists of numerous marsquakes which are among the strongest events located at epicentral distances beyond Cerberus Fossae.

Session: Planetary Seismology - I

Type: Oral

Date: 5/1/2024

Presentation Time: 05:15 PM (local time)

Presenting Author: John

Student Presenter: No

Invited Presentation: 

Authors