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Mysterious tsunami in the Caribbean Sea following the 2010 Haiti earthquake possibly generated by dynamically triggered early aftershocks

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Brink, Uri ten and Wei, Yong and Fan, Wenyuan and Granja Bruña, José Luis and Miller, Nathan (2020) Mysterious tsunami in the Caribbean Sea following the 2010 Haiti earthquake possibly generated by dynamically triggered early aftershocks. Earth and Planetary Science Letters, 540 (116269). ISSN 0012-821X

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0012821X20302120



Abstract

Dynamically triggered offshore aftershocks, caused by passing seismic waves from main shocks located on land, are currently not considered in tsunami warnings. The M7.0 2010 Haiti earthquake epicenter was located on land 27 km north of the Caribbean Sea and its focal mechanism was oblique strike-slip. Nevertheless, a tsunami recorded on a Caribbean Deep-Ocean Assessment and Reporting of Tsunami (DART) buoy and a tide gauge produced runup heights of 1–3 m along Haiti southeast coast. Earthquake finite-fault model inversions of the DART waveform suggest that a reverse fault doublet with magnitudes of M6.8 and M6.5 located 85 km southwest of the epicenter may have excited the tsunami. This doublet collocates with dynamically triggered aftershocks, derived from back-projection analysis, that occurred 20-60 s after the main shock of the Haiti earthquake. The aftershocks are within a region of maximum dynamic strain predicted by the main shock, on a possibly tectonically active submarine ridge southwest of Haiti's Southern Peninsula. The agreement between the tsunami finite-fault source models and the seismic and tectonic evidence suggests that earthquakes on land, even strike-slip faults, can generate tsunamis by dynamically triggering offshore aftershocks.


Item Type:Article
Uncontrolled Keywords:dynamically-triggered aftershocks, instantaneous aftershocks, tsunami warning protocol, DART buoy, tsunami from land-based earthquake, tsunami from strike-slip earthquake
Subjects:Sciences > Geology > Geodynamics
Sciences > Geology > Seismology
ID Code:60549
Deposited On:18 May 2020 10:58
Last Modified:19 May 2020 07:23

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