@article{ref1,
title="Anatomy of strike-slip fault tsunami genesis",
journal="Proceedings of the National Academy of Sciences of the United States of America",
year="2021",
author="Elbanna, Ahmed and Abdelmeguid, Mohamed and Ma, Xiao and Amlani, Faisal and Bhat, Harsha S. and Synolakis, Costas and Rosakis, Ares J.",
volume="118",
number="19",
pages="e2025632118-e2025632118",
abstract="Tsunami generation from earthquake-induced seafloor deformations has long been recognized as a major hazard to coastal areas. Strike-slip faulting has generally been considered insufficient for triggering large tsunamis, except through the generation of submarine landslides. Herein, we demonstrate that ground motions due to strike-slip earthquakes can contribute to the generation of large tsunamis (>1 m), under rather generic conditions. To this end, we developed a computational framework that integrates models for earthquake rupture dynamics with models of tsunami generation and propagation. The three-dimensional time-dependent vertical and horizontal ground motions from spontaneous dynamic rupture models are used to drive boundary motions in the tsunami model. Our results suggest that supershear ruptures propagating along strike-slip faults, traversing narrow and shallow bays, are prime candidates for tsunami generation. We show that dynamic focusing and the large horizontal displacements, characteristic of strike-slip earthquakes on long faults, are critical drivers for the tsunami hazard. These findings point to intrinsic mechanisms for sizable tsunami generation by strike-slip faulting, which do not require complex seismic sources, landslides, or complicated bathymetry. Furthermore, our model identifies three distinct phases in the tsunamic motion, an instantaneous dynamic phase, a lagging coseismic phase, and a postseismic phase, each of which may affect coastal areas differently. We conclude that near-source tsunami hazards and risk from strike-slip faulting need to be re-evaluated.<p /> <p>Language: en</p>",
language="en",
issn="0027-8424",
doi="10.1073/pnas.2025632118",
url="http://dx.doi.org/10.1073/pnas.2025632118"
}