A new strategy for earthquake focal mechanisms using waveform‐correlation‐derived relative polarities and cluster analysis: Application to the 2014 Long Valley …

DR Shelly, JL Hardebeck… - Journal of Geophysical …, 2016 - Wiley Online Library
In microseismicity analyses, reliable focal mechanisms can typically be obtained for only a
small subset of located events. We address this limitation here, presenting a framework for …

Using machine learning techniques with incomplete polarity datasets to improve earthquake focal mechanism determination

RJ Skoumal, DR Shelly… - … Society of America, 2023 - pubs.geoscienceworld.org
Earthquake focal mechanisms are traditionally produced using P‐wave first‐motion
polarities and commonly require well‐recorded seismicity. A recent approach that is less …

S/P Amplitude Ratios Derived from Single‐Component Seismograms and Their Potential Use in Constraining Focal Mechanisms for Microearthquake Sequences

DR Shelly, RJ Skoumal… - The Seismic …, 2022 - pubs.geoscienceworld.org
Focal mechanisms, which reflect the sense of slip in earthquakes, provide important
constraints for understanding crustal tectonics and earthquake source physics, including the …

Refined earthquake focal mechanism catalog for southern California derived with deep learning algorithms

Y Cheng, E Hauksson… - Journal of Geophysical …, 2023 - Wiley Online Library
Earthquake focal mechanisms, determined with P‐wave polarities and S/P amplitude ratios,
are primary data for analyzing fault zone geometry, sense of slip, and the crustal stress field …

Using corrected and imputed polarity measurements to improve focal mechanisms in a regional earthquake catalog near the Mt. Lewis fault zone, California

RJ Skoumal, JL Hardebeck… - Journal of Geophysical …, 2023 - Wiley Online Library
We utilized relative polarity measurements and machine learning techniques to better
resolve focal mechanisms and stress orientations considering a catalog of∼ 29,000 …

Quantifying focal mechanism heterogeneity for fault zones in central and southern California

IW Bailey, Y Ben-Zion, TW Becker… - Geophysical Journal …, 2010 - academic.oup.com
We present a statistical analysis of focal mechanism orientations for nine California fault
zones with the goal of quantifying variations of fault zone heterogeneity at seismogenic …

SKHASH: A Python package for computing earthquake focal mechanisms

RJ Skoumal, JL Hardebeck… - Seismological …, 2024 - pubs.geoscienceworld.org
We introduce a Python package for computing focal mechanism solutions. This algorithm,
which we refer to as SKHASH, is largely based on the HASH algorithm originally written in …

Multiplet focal mechanisms from polarities and relative locations: The Iznajar swarm in southern Spain

E Carmona, D Stich, JM Ibañez… - Bulletin of the …, 2009 - pubs.geoscienceworld.org
Abstract<? A3B2 twb=. 3w?> In April 1998, a swarm of∼ 1800 microearthquakes near the
village of Iznajar (southern Spain) was recorded at the Granada basin short-period seismic …

Point‐source inversion of small and moderate earthquakes from P‐wave polarities and P/S amplitude ratios within a hierarchical Bayesian framework: Implications for …

X Shang, H Tkalčić - Journal of Geophysical Research: Solid …, 2020 - Wiley Online Library
Characterizing seismic moment tensors of small‐to moderate‐magnitude earthquakes (ie,
2.5< M< 4.0) still represents a challenge in observational seismology. To address this …

Computing a large refined catalog of focal mechanisms for southern California (1981–2010): Temporal stability of the style of faulting

W Yang, E Hauksson… - Bulletin of the …, 2012 - pubs.geoscienceworld.org
Using the method developed by,) termed the HASH method, we calculate focal mechanisms
for earthquakes that occurred in the southern California region from 1981 to 2010. When …