Rupture Directivity of the 2021 MW 6.0 Yangbi, Yunnan Earthquake

Article Geochemistry & Geophysics

Short-Term Foreshock and Aftershock Patterns of the 2021 Ms 6.4 Yangbi Earthquake Sequence

Yingying Zhang et al.

Summary: An earthquake with a magnitude of 6.4 struck Yangbi County in western Yunnan province, China, on May 21, 2021, causing damage in the surrounding area. Intense foreshock activity preceded the mainshock, followed by numerous aftershocks along a right-lateral main rupture fault. By analyzing the foreshock and aftershock sequence, researchers were able to determine the geometry of the ruptured fault during the mainshock and understand the mechanism of static stress transfer.

SEISMOLOGICAL RESEARCH LETTERS (2022)

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Article Geochemistry & Geophysics

Fluids Triggered the 2021 Mw 6.1 Yangbi Earthquake at an Unmapped Fault: Implications for the Tectonics at the Northern End of the Red River Fault

Quan Sun et al.

Summary: This study analyzed the Yangbi earthquake in Yunnan, China using an improved tomography method, and discovered structural heterogeneities and the presence of fluids and potential melts in the source region. The upward migration of fluids may have triggered the earthquake by weakening a locked asperity. The study provides important insights into the seismic processes.

SEISMOLOGICAL RESEARCH LETTERS (2022)

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Article Geosciences, Multidisciplinary

Accrual of widespread rock damage from the 2019 Ridgecrest earthquakes

Alba M. Rodriguez Padilla et al.

Summary: Fracture density decreases with distance from the fault, leading to widespread damage in the region. Inelastic processes during earthquakes contribute to the formation of permanent damage zones, modifying the elastic properties of the crust and amplifying ground shaking. Combining fracture, strain, and aftershock maps, this study reconciles damage characteristics across different scales and resolutions.

NATURE GEOSCIENCE (2022)

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Article Geochemistry & Geophysics

The 21 May 2021 Mw 6.1 Yangbi Earthquake-A Unilateral Rupture Event with Conjugately Distributed Aftershocks

JunLei Chen et al.

Summary: This study investigated the source mechanism and fault geometry of the 6.1-magnitude earthquake in Yangbi, Yunnan, using seismic waveforms and Global Navigation Satellite System data. The results show that there were conjugately distributed aftershocks 10 km southeast of the mainshock's epicenter, and the rupture process of the mainshock exhibited sharp deceleration. Positive Coulomb stress was triggered by the largest foreshock on the mainshock fault plane. The changes in static coulomb stress due to the mainshock radiated beyond the bend zone of the Weixi-Qiaohou-Weishan fault.

SEISMOLOGICAL RESEARCH LETTERS (2022)

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Article Geochemistry & Geophysics

A high-resolution seismic catalog for the 2021 MS6.4/MW6.1 Yangbi earthquake sequence, Yunnan, China: Application of AI picker and matched filter

Yijian Zhou et al.

Summary: The high-resolution seismic catalog provides detailed research on the 2021 Yangbi earthquake sequence, using artificial intelligence pickers and a matched filter algorithm to provide reliable earthquake event detection and relocation data.

EARTHQUAKE SCIENCE (2021)

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Article Geochemistry & Geophysics