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Subsurface Resistivity Tomography Imaging of the 2018 Earthquake Impacted Areas in Lombok Island
Bagus Endar B. Nurhandoko1,2*, Muhammad Rizka Asmarahadi2, Bakti Sukrisna3, Syamsudin Yasin3, Dian W. Kurniawidi3, Insan Rizal Bakti Komara2, Wisnu Adiguntara2

1 Physics Department, Institut Teknologi Bandung, Jalan Ganesha 10 Bandung, Indonesia;
2 Rock Fluid Imaging Lab, Bandung, Indonesia
3 Physics Department, University of Mataram, Indonesia


Abstract

The series of Lombok earthquake started from July 2018 followed by two mainshocks and thousands aftershocks caused massively damage to the public facilities and residential areas. As a result of the earthquake measuring 6.9 SR, most of the wells were also damaged due to liquefaction. The most devastated areas usually have several units of lithology, namely: coastal sediment alluvium and pyroclastic rock. This research was conducted to characterize subsurface geological condition including groundwater aquifers using 2D resistivity tomography. Series measurements of 2D resistivity tomography at the some impacted area of 2018 Lombok Earthquake can reveal the relationship among the most of devastated area, the subsurface geological condition, the vibration, and also the most impacted liquifaction area. The most of impacted areas caused by 2018 Earthquakes lie on the very loose sand and shallow aquifer zone. The resistivity tomography, however, shows that in the North Lombok area usually has high resistivity thin layer (with a range of> 500 Ohm.m) around a depth of 10 m. This high resistivity layer is carbonate reef layer which may play a role as barrier of soil liquifaction especially when the earthquake’s wave vibrates the soil.

Keywords: Resistivity tomography, Lombok Earthquake, Liquifaction

Topic: Earth and Planetary Sciences

Link: https://ifory.id/abstract/DzutkReG7Mgp

Conference: Asian Physics Symposium (APS 2019)

Plain Format | Corresponding Author (Bagus Endar Bachtiar Nurhandoko)

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