Correlation between Building Damages and Losses with the Microzonation Map of Mataram—Case Study: Lombok Earthquake 2018, Indonesia

Bambang Setyogroho,Dicky Muslim,Ghazi Oktavidi Muslim,Hendarmawan Hendarmawan,Safri Burhanuddin,Muhammad Suwongso Sadewo

doi:10.3390/su14042028

Bambang Setyogroho, Dicky Muslim + Show 4 more

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https://doi.org/10.3390/su14042028

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Abstract

The high intensity of the earthquake on Lombok Island on 5 August 2018, with a magnitude of 7.0 Mb, caused material losses experienced by the affected residential areas. The Indonesian Geological Agency in 2015 published a microzonation map that mapped zones prone to earthquake shocks to mitigate disasters. This study aimed to compare the level of damage and loss in residential areas due to earthquakes in Mataram City with earthquake-prone zones using a microzonation map. The correlation between damage and loss value of residentials with microzonation maps was evaluated using the overlay method. The results showed that the level of damage and the value of the loss of houses in the high disaster-prone zone (red zone) showed the highest loss value. In comparison, the level of losses in the moderate disaster-prone zone (yellow zone) and light disaster-prone zone (blue zone) on the microzonation map shows a low and lower loss value. This study concludes that the microzonation map helps determine the damage zone and the level of disaster vulnerability caused by the earthquake hazard.

Highlights

The location of Indonesia in the collision zone causes frequent natural disasters.Earthquakes are one of such disasters caused by tectonic activities
The dynamic interaction of numerous tectonic plates in eastern Indonesia causes high seismicity rates, which resulted in catastrophic damaging earthquake sequences on Lombok Island in 2018 [1,2,3]
The research area in the present study has a thickness of the soft rock, causing earthquake waves to be trapped and amplified, which explains the higher level of damage

Summary

Introduction

The location of Indonesia in the collision zone causes frequent natural disasters. Earthquakes are one of such disasters caused by tectonic activities. The dynamic interaction of numerous tectonic plates in eastern Indonesia causes high seismicity rates, which resulted in catastrophic damaging earthquake sequences on Lombok Island in 2018 [1,2,3]. Based on the National Disaster Management Agency (BNPB) records, from the beginning of 2017 to June 2018, there have been 4006 disasters in Indonesia, with 30 tectonic earthquakes on Lombok Island occurring in August 2018 with a magnitude of 5.9–6.9. The earthquake in Lombok claimed at least 481 lives and caused an economic loss of US$. 514,000,000 as of 17 August 2018 [4] These financial losses are caused mainly by damage to infrastructure and buildings

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