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Regional Moment Tensors for Texas

Description: 

Easy access to digital waveform data from TexNet and other networks permits the determination of regional moment tensors, earthquake magnitude and seismic structure within Texas. Our catalog of over 175 moment tensors is dominated by events in the Delaware and Midland Basins of western Texas, being complete for Mw > 3.4, with some events having Mw as low as 2.9. Source depths vary between 3 and 12 km, with over half between 8 and 10 km. The Saint Louis University generic western US velocity model (WUS) fits waveforms well. Events in the Delaware Basin are characterized by normal faulting along a 60 km E-W trend, while events in the Midland Basin are aligned in an NE-SW direction with a mixture of normal and strike-slip mechanisms. A determination of regional ML and mLg for each event shows that high frequency ground motion out to several hundred km is similar to that of the stable continental interior of the central and eastern US rather than to that of the western US.

There has not been much success in determining moment tensors for the smaller number of events in the Eagle Ford Basin in the southeast of the state, lacking an appropriate velocity model. To address that need, ambient noise processing using the continuous waveform data of TexNet is being performed to augment the dispersion data set previously distributed by Herrmann et al (2021, SRL 92, pp. 3642-3656). The derived dispersion can be used to check the appropriateness of using the WUS velocity model in the west.

Session: Induced Earthquakes: Source Characteristics, Mechanisms, Stress Field Modeling and Hazards - I

Type: Oral

Date: 5/1/2024

Presentation Time: 08:45 AM (local time)

Presenting Author: Robert

Student Presenter: No

Invited Presentation: 

Authors