Abstract

The Aceh and Seulimeum Faults flank the Krueng Aceh Basin in Indonesia, and the shear-wave velocity (Vs) structure of the basin is not extensively available. Understanding the Vs structure is very important in order to figure out how the basin structures seemingly appear, and this can eventually be used to generate a microzonation map for other forthcoming studies. To provide this, Vs was measured over an area approximately covering Banda Aceh City and its surroundings, by setting two lines consisting of eight points projected in the NW–SE and SW–NE orientations. This research aims to facilitate the approximation of the Vs structure characteristics of the Krueng Aceh Basin using the microtremor array method (MAM). Triangular configurations were set by deploying four seismometers following an M-station geometry for three different array sizes (i.e., 3, 10, and 30 m in distance). The data were then processed by utilizing the spatial autocorrelation (SPAC) technique. The result shows that the Vs structure generally dips down from SE to NW, and it gradually declines from SW to NE. The combination of these Vs structures tends to be oblique toward the SW–NE direction. This form may be affected by the Aceh Segment Fault which is more active than the Seulimeum Segment Fault. The average maximum penetration depth and Vs are 603 m and 947.5 m/s in the SE–NW orientation, and 650 m and 958 m/s in the SW–NE direction. Generally, the thickness of the strata is greater in the upstream area compared to the downstream area. Their composition consists of alluvium (A) at the uppermost layer and diluvium (D) at the underlying layers. Then, all of the identified strata are aged from the Pleistocene to Tertiary Pleistocene (Tp). These characteristics of the strata could potentially cause surface damages as a result of site effect responses when an earthquake is occurring.

Highlights

  • The prediction of shear-wave velocity (Vs) is critical for site response analysis in areas prone to destructive earthquakes

  • To mitigate the loss of life and damages from devastating earthquakes in the future, many performed an investigation of the Vs structure at a depth of greater than 30 m to derive site effects researchers [1,2] around the world have studied the site effect of ground motion

  • The MA3 point of the Vs measurement is relatively close to the Aceh Segment Fault (ASF) that extends about 6 km away

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Summary

Introduction

The prediction of shear-wave velocity (Vs) is critical for site response analysis in areas prone to destructive earthquakes. To mitigate the loss of life and damages from devastating earthquakes in the future, many biggest earthquakes of the the world last several and causedmotion. Massive The loss authors of life and researchers [1,2] around havedecades studied worldwide, the site effect of itground of [3] property. To mitigate the loss of life and damages from devastating earthquakes in the future, many performed an investigation of the Vs structure at a depth of greater than 30 m to derive site effects researchers [1,2] around the world have studied the site effect of ground motion.

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