Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 19, Pages 10155-10163Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL070418
Keywords
deformation distribution; geological structure control; rupture complexity; Balochistan earthquake; optical image correlation; surface displacement field
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Funding
- ANR GeoSMEC [ANR-12-BS06-0016]
- Agence Nationale de la Recherche (ANR) [ANR-12-BS06-0016] Funding Source: Agence Nationale de la Recherche (ANR)
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The 2013 M(w)7.7 Balochistan earthquake, Pakistan, ruptured the Hoshab fault. Left-lateral motion dominated the deformation pattern, although significant vertical motion is found along the southern part of the rupture. Correlation of high-resolution (2.5m) optical satellite images provided horizontal displacement along the entire rupture. In parallel, we mapped the ground rupture geometry at 1:500 scale. We show that the azimuth of the ground rupture distributes mainly between two directions, N216 degrees and N259 degrees. The direction N216 degrees matches the direction of preexisting geologic structures resulting from penetrative deformation caused by the nearby Makran subduction. Hence, during a significant part of its rupture, the 2013 Balochistan rupture kept switching between a long-term fault front and secondary branches, in which existence and direction are related to the compressional context. It shows unambiguous direct interactions between different preexisting geologic structures, regional stress, and dynamic-rupture stress, which controlled earthquake propagation path.
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