Bayesian Framework for Inversion of Second‐Order Stress Glut Moments: Application to the 2019 Ridgecrest Sequence Mainshock

Atterholt, James; Ross, Zachary E.

doi:10.1029/2021jb023780

JGR Solid Earth

2022

DOI: 10.1029/2021jb023780

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Bayesian Framework for Inversion of Second‐Order Stress Glut Moments: Application to the 2019 Ridgecrest Sequence Mainshock

James Atterholt

Zachary E. Ross

Abstract: Earthquakes are known to exhibit complex rupture processes that vary strongly in space and time. A better understanding of the factors controlling earthquake behavior consequently requires constraining the finite source properties of earthquakes. Today, high dimensional estimates (∼1,000 parameters) of finite source properties are routinely computed for significant earthquakes (e.g.,

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2023

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Cited by 1 publication

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Finite source properties of large strike-slip earthquakes

Atterholt,

Ross

2023

Geophysical Journal International

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SUMMARY Earthquake ruptures are complex physical processes that may vary with the structure and tectonics of the region in which they occur. Characterizing the factors controlling this variability would provide fundamental constraints on the physics of earthquakes and faults. We investigate this by determining finite source properties from second moments of the stress glut for a global data set of large strike-slip earthquakes. Our approach uses a Bayesian inverse formulation with teleseismic body and surface waves, which yields a low-dimensional probabilistic description of rupture properties including the spatial deviation, directivity and temporal deviation of the source. This technique is useful for comparing events because it makes only minor geometric constraints, avoids bias due to rupture velocity parametrization and yields a full ensemble of possible solutions given the uncertainties of the data. We apply this framework to all great strike-slip earthquakes of the past three decades, and we use the resultant second moments to compare source quantities like directivity ratio, rectilinearity, average moment density and vertical deviation. We find that most strike-slip earthquakes have a large component of unilateral directivity, and many of these earthquakes show a mixture of unilateral and bilateral behaviour. We notice that oceanic intraplate earthquakes usually rupture a much larger width of the seismogenic zone than other strike-slip earthquakes, suggesting these earthquakes may often breach the expected thermal boundary for oceanic ruptures. We also use these second moments to resolve nodal plane ambiguity for the large oceanic intraplate earthquakes and find that the rupture orientation is usually unaligned with encompassing fossil fracture zones.

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Finite source properties of large strike-slip earthquakes

Atterholt,

Ross

2023

Geophysical Journal International

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Bayesian Framework for Inversion of Second‐Order Stress Glut Moments: Application to the 2019 Ridgecrest Sequence Mainshock

Cited by 1 publication

References 52 publications

Finite source properties of large strike-slip earthquakes

Finite source properties of large strike-slip earthquakes

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