Environmental effects following a seismic sequence: the 2019 Cotabato—Davao del Sur (Philippines) earthquakes

M. F. Ferrario (), J. S. Perez, M. Dizon, F. Livio, J. Rimando and A. M. Michetti
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M. F. Ferrario: Università Degli Studi Dell’Insubria
J. S. Perez: Department of Science and Technology - Philippine Institute of Volcanology and Seismology (DOST-PHIVOLCS)
M. Dizon: Department of Science and Technology - Philippine Institute of Volcanology and Seismology (DOST-PHIVOLCS)
F. Livio: Università Degli Studi Dell’Insubria
J. Rimando: McMaster University
A. M. Michetti: Università Degli Studi Dell’Insubria

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2024, vol. 120, issue 7, No 8, 6125-6147

Abstract: Abstract In the period of October–December 2019, the Cotabato–Davao del Sur region (Philippines) was hit by a seismic sequence comprising four earthquakes with magnitude MW > 6.0 (EQ1-4; max magnitude MW 6.8). The earthquakes triggered widespread environmental effects, including landslides and liquefaction features. We documented such effects by means of field surveys, which we supplemented with landslide mapping from satellite images. Field surveys allowed us to gather information on 43 points after EQ1, 202 points after EQs2–3 and 87 points after EQ4. Additionally, we built a multi-temporal inventory of landslides from remote sensing, comprising 190 slope movements triggered by EQ1, 4737 after EQs2–3, and 5666 at the end of the sequence. We assigned an intensity value to each environmental effect using the environmental seismic intensity (ESI-07) scale. Our preferred estimates of ESI-07 epicentral intensity are VIII for the first earthquake and IX at the end of the sequence, which is in broad agreement with other events of similar magnitude globally. This study, which is the first case of the application of the ESI-07 scale to a seismic sequence in the Philippines, shows that repeated documentation of environmental damage and the evaluation of the progression through time may be useful for providing input data for derivative products, such as susceptibility assessment, evaluation of residual risk or investigation of the role played by ground shaking and by other mechanisms able to trigger environmental effects.

Keywords: Seismic sequence; Earthquake environmental effects; ESI-07 intensity; Earthquake-induced landslides (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s11069-024-06467-7

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