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Insights Into the 2020 Monte Cristo Range Earthquake Sequence From a Near-source Aftershock Deployment

Description: 

High resolution, near-source data can provide crucial information about earthquake processes, including enhanced detection of small earthquakes and improved source characterization due to minimal path attenuation. The Nevada National Security Site (NNSS) deployed 48 nodal geophones, referred to as LASSO (Large Array for Seismic Sensing and Observations) within hours (and meters) of the 2020 6.5, Monte Cristo Range earthquake (MCRE). With the data from this 3-month deployment, supplemented by regional seismic recordings from the Nevada Seismological Laboratory (NSL), we developed a machine learning workflow to generate a new, high resolution earthquake catalog for the MCRE aftershock sequence. Phase arrivals from the dense aftershock deployment improves detection capability several orders of magnitude beyond current published results while also providing improved constraints on earthquake locations, magnitudes, and seismic radiation patterns of small earthquakes. This unique dataset newly illuminates key characteristics of a highly active aftershock sequence and provides the foundation for future near-source analyses.

This work was done by Mission Support and Test Services, LLC, under Contract No. DE- NA0003624 with the U.S. Department of Energy and the National Nuclear Security Administration’s Office of Defense Nuclear Nonproliferation. DOE/NV/03624--2094.

Session: Building and Decoding High-resolution Earthquake Catalogs With Statistical and Machine-learning Tools - I

Type: Oral

Date: 4/15/2025

Presentation Time: 05:30 PM (local time)

Presenting Author: Maia

Student Presenter: Yes

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