Karakteristik Gempabumi Di Sesar Matano Menggunakan Analisis Energi Kumulatif Dan Periode Ulang

Kurniawati, Indah; Ratri, Aldilla Damayanti Purnama; Gunawan, Tomy

doi:10.20956/geocelebes.v4i1.8919

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…The research area is sited in Morowali Regency, Central Sulawesi, near the Geresa Segment of the Matano Fault. In terms of morphology, the Matano Fault is divided into several segments including the Kuleana Segment, Pewusai Segment, Matano Segment, Pamsoa Segment, Ballawai Segment, and Geresa Segment (Kurniawati, 2020). Based on geodetic estimation, the Matano Fault has a shear rate of 14-44 mm/year (PUSGEN, 2017).…”

Section: Introductionmentioning

confidence: 99%

The Utilization of LiCSBAS for Deformation Monitoring in Geresa Segment of Matano Fault, Central Sulawesi, Indonesia

Muhammad Razzaaq Al Ghiffari,

Djoko Nugroho,

Rachmat Ramadhan

et al. 2024

J. Geoscience Eng. Environ. Technol.

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Sulawesi is situated between the confluence of three plates, resulting in a very complex tectonic setting on the island. This has an impact on the occurrence of geological structures, including faults. One of them is the Matano Fault which consists of 6 segments (Kuleana Segment, Pewusai Segment, Matano Segment, Pamsoa Segment, Ballawai Segment, and Geresa Segment). The research area is located in Morowali Regency, covering the Geresa Segment. Morowali Regency recorded an earthquake with a magnitude of 5.7 in 2012. This indicates that deformation has occurred. Therefore, this study aims to identify the deformation velocity around the Geresa Segment area. The methods used are geological observation and satellite image data processing to obtain information on deformation rates. The geological field study includes aspects of geomorphology, geological structure, and the rock types distribution. Meanwhile, the processing of satellite image data in the form of InSAR is carried out through the LiCSBAS package tools that has been integrated with LiCSAR. The analysis results illustrate the difference in deformation velocity around the Geresa Segment area. The area which is composed of Tolaka formation and Ultramafic complex tends to uplift with a deformation rate of up to 17 mm/year. In addition, alluvium that covers the southeastarn part has a land subsidence of up to 7 mm/year.

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Section: Introductionmentioning

confidence: 99%

The Utilization of LiCSBAS for Deformation Monitoring in Geresa Segment of Matano Fault, Central Sulawesi, Indonesia

Muhammad Razzaaq Al Ghiffari,

Djoko Nugroho,

Rachmat Ramadhan

et al. 2024

J. Geoscience Eng. Environ. Technol.

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“…Hal ini karena Sesar Matano sering diasumsikan merupakan kelanjutan dari sesar Palu-Koro (Socquet et al, 2006). Penelitian lain di sesar Matano seperti analisis energi kumulatif dan periode ulang untuk mengetahui karasteristik gempa bumi (Kurniawati et al, 2020). Ada pun penelitian yang menggunakan hiposenter dan mekanisme fokus seperti gempa pada tanggal 29 Mei 2017 di Poso, Sulawesi Tengah (M. F. I. Massinai et al, 2019)) dan gempa pada tanggal 4 Januari 2009 di Manokwari, Papua Barat (Umar et al, 2016).…”

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Penentuan Hiposenter Dan Mekanisme Fokus Gempa Bumi MLv4,8 1 Januari 2015 Di Sekitar Sesar Matano

Massinai

Astuti

et al. 2020

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Tujuan penelitian ini adalah untuk mengetahi mekanisme bidang sesar penyebab terjadinya gempa tersebut dengan menggunakan hiposenter dan mekanisme fokus. Penelitian ini menggunakan gelombang gempa/ waveform MLv4,8 1 Januari 2015 yang terekam pada beberapa stasiun pengamatan gempa milik BMKG. Waveform tersebut diolah untuk mendapatkan arrival time gelombang P dan S serta polaritas pertama arrival gelombang P. Metode yang digunakan untuk menentukan hiposenter adalah Metode Geiger dengan masukan arrival time gelombang P dan S. Mekanisme fokus ditentukan menggunakan polaritas fase pertama arrival gelombang P dan hiposenter dari langkah sebelumnya. Hiposenter yang didapatkan dari penelitian ini berada pada 2,2073 0 LS, 120,798 0 BT dan kedalaman 10 km. RMS hasil perhitungan ini sebesar 0,7391. Mekanisme fokus gempa ini adalah sesar oblique yaitu sesar normal dengan komponen sinistral/ left-lateral strike slip dengan parameter strike 312 0 , dip 71 0 dan rake-14 0. Hasil ini konsisten dengan jenis Sesar Matano sebagai kelanjutan dari Sesar Palu-Koro. Gempa ini terjadi akibat aktivitas Sesar Matano. Hasil penelitian ini dapat menjadi dasar dari mitigasi bencana alam gempa bumi di daerah sepanjang Sesar Matano.

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Interpreting Fault Dynamics in Terms of Hypocenter Relocation and Fault Characterization

Massinai,

Bamba,

Ical

et al. 2024

Geodin. tektonofiz.

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Southeast and Central Sulawesi are the areas characterized by high tectonic activity due to the presence of the active Matano fault. The seismicity along this fault is high. However, the initial hypocenter often deviates from the fault’s trend line, thus causing the need for earthquake relocation with an improved local structure description. The double difference method stands out as a precise technique for hypocenter relocation, utilizing the data on relative travel time between hypocenter pairs. After relocation, the selected hypocenter facilitates the derivation of a focal mechanism, crucial in determining fault types. In this research, we relocated the hypocenters of 485 events of January 2009 to December 2016, ranging in magnitude from M2 to M6.1, 427 of which showed a pattern close to the general trend of major and minor faults. Seismic offsets along the Matano fault are predominantly oriented in the southeast or northwest direction. Moreover, most of the earthquake activity recorded at a depth of 10 km before relocation is no longer visible. Based on the statistics, the time residuals from –2.5 to +2.5 ms resulting from the relocation procedure are better close to 0 than those of –4.5 to +4.5 ms for the events before relocation. The focal mechanism solutions of 16 events of final relocation are dominated by strike-slip faulting. The Matano fault is predominantly sinistral-type. The seismicity along this fault zone results from an activity of this fault, which is the main source of earthquakes, and from its interaction with the neighboring Palu-Koro and Sorong faults.

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Karakteristik Gempabumi Di Sesar Matano Menggunakan Analisis Energi Kumulatif Dan Periode Ulang

Cited by 3 publications

References 6 publications

The Utilization of LiCSBAS for Deformation Monitoring in Geresa Segment of Matano Fault, Central Sulawesi, Indonesia

The Utilization of LiCSBAS for Deformation Monitoring in Geresa Segment of Matano Fault, Central Sulawesi, Indonesia

Penentuan Hiposenter Dan Mekanisme Fokus Gempa Bumi MLv4,8 1 Januari 2015 Di Sekitar Sesar Matano

Interpreting Fault Dynamics in Terms of Hypocenter Relocation and Fault Characterization

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