Was the Pesawaran Swarm Induced by Magmatic Fluids? Insight from Magnetic Method Analysis

DOI

10.2991/apr.k.220503.025How to use a DOI?

Keywords

Inferred Menanga Fault; Magnetic Anomaly; Pesawaran; magmatic fluid

Abstract

An earthquake swarm in January 2021 triggered research related to adjacent geological structures, mainly inferred Menanga fault having predicted in the previous studies. This study is focused on investigating the fault and volcanic -related activity in terms of magnetic field anomalies due to sensitivity of susceptibility. By measuring 55 points with 500 m intervals, the observed magnetic values are processed to Reduction to Pole (RTP) anomalies and interpreted by adopting the successive decomposition method. This method generates pseudo-depth structures using the subtraction between below and above residual anomalies for each slice. The result indicates that variation of variated rocks is detected by a short-wavelength magnetic anomaly in slice 1, whereas an NW-SE high anomaly at the southern part research area indicates volcanic activity, which may related to magmatic fluid injection. This magmatic fluid injection reactivated the inferred Menanga fault causing the earthquake swarms. The dimming upward of the high anomaly explains the magmatic injection have not been involved toward the surface and remain isolated at depth.

Copyright

© 2022 The Authors. Published by Atlantis Press International B.V.

Open Access

This is an open access article distributed under the CC BY-NC 4.0 license.

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TY  - CONF
AU  - Yudha Styawan
AU  - Izaina Nurfitriana
AU  - Rizky Wulandari
PY  - 2022
DA  - 2022/05/25
TI  - Was the Pesawaran Swarm Induced by Magmatic Fluids? Insight from Magnetic Method Analysis
BT  - Proceedings of the Soedirman International Conference on Mathematics and Applied Sciences (SICOMAS 2021)
PB  - Atlantis Press
SP  - 133
EP  - 137
SN  - 2352-541X
UR  - https://doi.org/10.2991/apr.k.220503.025
DO  - 10.2991/apr.k.220503.025
ID  - Styawan2022
ER  -