Coseismic deformation of the 19 August 2018 Mw 7.2 Lombok earthquakes, Indonesia, estimated through InSAR and GPS observations

This study investigates the distribution of coseismic slip of the 19th August 2018 M w 7.2 Lombok earthquakes, Indonesia, using Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) data. Two look directions on ascending, with a maximum displacement of 27 cm and 35 cm,...

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Veröffentlicht in:Natural hazards (Dordrecht) 2023-10, Vol.119 (1), p.545-558
Hauptverfasser: Gunawan, Endra, Amey, Ruth, Elliott, John, Widiyantoro, Sri, Puspito, Nanang T., Hanifa, Nuraini Rahma, Syamsuddin, Hussain, Ekbal
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container_start_page 545
container_title Natural hazards (Dordrecht)
container_volume 119
creator Gunawan, Endra
Amey, Ruth
Elliott, John
Widiyantoro, Sri
Puspito, Nanang T.
Hanifa, Nuraini Rahma
Syamsuddin
Hussain, Ekbal
description This study investigates the distribution of coseismic slip of the 19th August 2018 M w 7.2 Lombok earthquakes, Indonesia, using Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS) data. Two look directions on ascending, with a maximum displacement of 27 cm and 35 cm, and one on descending of Sentinel-1 SAR data, with a maximum displacement of 12 cm, are used. In addition, static offsets from the GPS data, which are located at the most western part of the island and the northern part of the island, detect ~ 2 cm and ~ 5 cm coseismic displacement due to the earthquake. Using combined InSAR and GPS data, this study estimates the fault location, fault geometry and the coseismic slip distribution by a joint inversion using a trans-dimensional Bayesian method. This method solves for the contiguous area of the fault that is allowed to slip in the inversion whilst also solving for the magnitude. This dampens the spurious smoothing that can occur in distributed slip solutions, in particular with far-field geodetic data or deep sources. The maximum slip of ~ 3.5 m is located at deeper portion of the fault at ~ 21 km, adjacent to the epicenter of the earthquake. This study demonstrates that the coseismic slip of the 19th August 2018 earthquakes occurred on a structure further south towards Lombok, a parallel fault structure with Flores back arc thrust.
doi_str_mv 10.1007/s11069-023-06142-3
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subjects Bayesian analysis
Civil Engineering
Deformation
Distribution
Earth and Environmental Science
Earth Sciences
Earthquakes
Environmental Management
Fault lines
Fault location
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Global positioning systems
GPS
Hydrogeology
Interferometric synthetic aperture radar
Natural Hazards
Original Paper
Positioning systems
Probability theory
SAR (radar)
Seismic activity
Slip
Spatial data
Synthetic aperture radar
Synthetic aperture radar interferometry
title Coseismic deformation of the 19 August 2018 Mw 7.2 Lombok earthquakes, Indonesia, estimated through InSAR and GPS observations
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