Earthquake statistics changed by typhoon-driven erosion

Philippe Steer, Louise Jeandet, Nadaya Cubas, Odin Marc, Patrick Meunier, Martine Simoes, Rodolphe Cattin, J. Bruce H. Shyu, Maxime Mouyen, Wen Tzong Liang, Thomas Theunissen, Shou Hao Chiang, Niels Hovius

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Tectonics and climate-driven surface processes govern the evolution of Earth’s surface topography. Topographic change in turn influences lithospheric deformation, but the elementary scale at which this feedback can be effective is unclear. Here we show that it operates in a single weather-driven erosion event. In 2009, typhoon Morakot delivered ~ 3 m of precipitation in southern Taiwan, causing exceptional landsliding and erosion. This event was followed by a step increase in the shallow (< 15 km depth) earthquake frequency lasting at least 2.5 years. Also, the scaling of earthquake magnitude and frequency underwent a sudden increase in the area where mass wasting was most intense. These observations suggest that the progressive removal of landslide debris by rivers from southern Taiwan has acted to increase the crustal stress rate to the extent that earthquake activity was demonstrably affected. Our study offers the first evidence of the impact of a single weather-driven erosion event on tectonics.

Original languageEnglish
Article number10899
JournalScientific Reports
Volume10
Issue number1
DOIs
StatePublished - 1 Dec 2020

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