Abstract
A Mw 7.4 earthquake hit Donggala County, Central Sulawesi Province, Indonesia, on 28 September 2018, triggering a tsunami and liquefaction in Palu City and Donggala. Around 2101 fatalities ensued and 68,451 houses were damaged by the earthquake. In light of this devastating event, a post-earthquake map is required to establish the first step in the evacuation and mitigation plan. In this study, remote sensing imagery from the Landsat-8 and Sentinel-2 satellites was used. Pre- and post-earthquake satellite images were classified using artificial neural network (ANN) and support vector machine (SVM) classifiers and processed using a decorrelation method to generate the post-earthquake damage map. The affected areas were compared to the field data, the percentage conformity between the ANN and SVM results was analyzed, and four post-earthquake damage maps were generated. Based on the conformity analysis, the Landsat-8 imagery (85.83%) was superior to that of Sentinel-2 (63.88%). The resulting post-earthquake damage map can be used to assess the distribution of seismic damage following the Palu earthquake and may be used to mitigate damage in the event of future earthquakes.
Highlights
On 28 September 2018, at 17:02 UTC + 7, a Mw 7.4 earthquake hit Donggala County in CentralSulawesi, Indonesia, as reported by the National Board for Disaster Management (BNPB) of Indonesia [1].The earthquake’s epicenter was located around 26 km northeast of Donggala (0.20 S, 119.89 E); the earthquake occurred at a depth of 11 km as a result of strike–slip faulting of the Sesar Palu-Koro fault at shallow depths within the interior of the Molucca Sea microplate, part of the broader Sunda tectonic plate [2]
The classification map waswas divided intointo five five classes
The classification map divided classes based on the colors shown by the false color band combination from river, bare land, and clouds) based on the colors shown by the false color band combinationthe from the Landsat‐8 satellite images
Summary
On 28 September 2018, at 17:02 UTC + 7, a Mw 7.4 earthquake hit Donggala County in Central. The earthquake’s epicenter was located around 26 km northeast of Donggala (0.20 S, 119.89 E); the earthquake occurred at a depth of 11 km as a result of strike–slip faulting of the Sesar Palu-Koro fault at shallow depths within the interior of the Molucca Sea microplate, part of the broader Sunda tectonic plate [2]. According to a press release issued by the Indonesia Meteorological, Climatological, an Geophysical Agency (BMKG) in the ASEAN Coordination Centre for Humanitarian Assistance on disaster management (AHA Centre), up to 27 October 2018 at 07.00 (UTC + 7), 770 aftershocks were recorded, with maximum and minimum magnitudes of M 6.3 and M 2.9, respectively [3]. Hundreds of people went missing from the Balaroa and Petobo villages, which were buried completely
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