Surface rupture kinematics of the 2020 Mw 6.6 Masbate (Philippines) earthquake determined from optical and radar data

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ID: 280797
2024
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Abstract

Optical correlation, interferometry, and field investigation of laterally offset features were undertaken to analyze the kinematics of the 2020 Mw 6.6 Masbate earthquake. Ground displacement fields show a peak left-lateral offset of 0.6 m corresponding to Mw 6.6 geodetic moment magnitude, with an average 0.4 m left-lateral slip. The slip distributions also indicate a single asperity located ∼200 m SE of the centroid. Post-seismic deformation estimates from interferometry highlight an at least 0.14 m left-lateral offset consistent with a Mw 6.2 post-seismic moment magnitude. The total and post-seismic slip distributions coincide with each other, with both peaks adjacent to the centroid. Slip measurements and the ∼28.2–41 km rupture length estimates from field and remote sensing datasets characterize the Masbate segment as capable of producing long ruptures with significant offsets despite the presence of interseismic creep. Post-seismic interferograms resolved the rupture far better than optical correlation, which was degraded due to high-amplitude noise from sensor and environmental sources. Nevertheless, this review of the 2020 Mw 6.6 Masbate earthquake provides a comprehensive slip measurement of the surface rupture and demonstrates the presence of two transtensional basins in the Masbate province, revealing new insights into the seismic hazard and seismotectonic setting of the central Philippines.

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rita2024surfacenatural Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Rita, K. S. Sta.;Valkaniotis, S.;Lagmay, A. M. F.;Lagmay, A. M. F.;
Journal natural hazards and earth system sciences
Year 2024
DOI
DOI not found
URL
https://nhess.copernicus.org/articles/24/1135/2024/nhess-24-1135-2024.pdf
Keywords
Zoology Education Medicine Science environmental sciences social sciences geology geography. anthropology. recreation environmental technology. sanitary engineering

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