Journal
SCIENCE
Volume 349, Issue 6252, Pages 1091-1095Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aac6383
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Funding
- Caltech
- DASE
- Gordon and Betty Moore Foundation [GBMF 423.01, GBMF 3024]
- NSF [EAR-1345136]
- United Nations Development Programme
- Nepal Academy for Science and Technology
- NASA (USA)
- Department of Foreign International Development (UK)
- NSF
- NASA under NSF [EAR-1261833]
- NASA [NNX14AQ53G, NNX14AT33G]
- Royal Society
- Directorate For Geosciences
- Division Of Earth Sciences [1261833] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1345136] Funding Source: National Science Foundation
- NASA [674058, NNX14AQ53G, NNX14AT33G, 674060] Funding Source: Federal RePORTER
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Detailed geodetic imaging of earthquake ruptures enhances our understanding of earthquake physics and associated ground shaking. The 25 April 2015 moment magnitude 7.8 earthquake in Gorkha, Nepal was the first large continental megathrust rupture to have occurred beneath a high-rate (5-hertz) Global Positioning System (GPS) network. We used GPS and interferometric synthetic aperture radar data to model the earthquake rupture as a slip pulse similar to 20 kilometers in width, similar to 6 seconds in duration, and with a peak sliding velocity of 1.1 meters per second, which propagated toward the Kathmandu basin at similar to 3.3 kilometers per second over similar to 140 kilometers. The smooth slip onset, indicating a large (similar to 5-meter) slip-weakening distance, caused moderate ground shaking at high frequencies (>1 hertz; peak ground acceleration, similar to 16% of Earth's gravity) and minimized damage to vernacular dwellings. Whole-basin resonance at a period of 4 to 5 seconds caused the collapse of tall structures, including cultural artifacts.
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