Seismicity analysis Sulawesi North Arm based on B-Values

Massinai, Muhammad Altin; Harimei, Bambang; Agustiawati, A

doi:10.1088/1742-6596/1341/8/082032

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…Beberapa penelitian terdahulu membahas mengenai aktivitas seismik yang terjadi di wilayah Gorontalo dan sekitarnya diantaranya (Massinai et al, 2019;Manyoe et al, 2019) serta kondisi tektonik dan keterdapatan struktur geologi (Hall & Wilson, 2000;Milsom, 2001;Hinschberger et al, 2005;Molnar & Dayem, 2010;Advokaat et al, 2017). Penelitian yang dilakukan oleh Manyoe et al, (2019), menganalisis tingkat kerusakan yang diakibatkan oleh gempabumi berdasarkan aktivitas seismik dan percepatan tanah di wilayah Gorontalo.…”

Section: Pendahuluanunclassified

Analisis Parameter Gempabumi Dengan Struktur Geologi Di Daerah Asparaga, Gorontalo

Madusila

Manyoe

Male

2021

Jambura Geosci. Rev.

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Gorontalo is an area located in the North Arm of Sulawesi which has a complex geological structure as a result of the submergence of the Sulawesi Sea and East Sangihe so that this area is considered an earthquake-prone area. The existence of the regional structure and the mapping of the earthquake point distribution is interesting to be studied more deeply because it affects seismic activity in the area. The purpose of this study is to analyze earthquakes in the Asparaga area based on their depth and magnitude and to relate them to the geological structures found in the study area. The earthquake data used were obtained from USGS. Satellite image data used is the SRTM satellite image. Earthquake data is mapped to produce depth maps, magnitude maps, and earthquake zoning maps. Lineament data were processed using a rosette diagram. Lineament can reflect the morphology observed on the earth's surface as a result of the activity of geological forces. The results showed that the Asparaga area had shallow earthquake depths and moderate to large magnitudes. The focus of the earthquake was right on the path traversed by the geological structure and its relatively northwest-southeast direction. The geological structure in the research location is the epicenter of the earthquake because it is crossed by regional geological structures.

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Section: Pendahuluanunclassified

Analisis Parameter Gempabumi Dengan Struktur Geologi Di Daerah Asparaga, Gorontalo

Madusila

Manyoe

Male

2021

Jambura Geosci. Rev.

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Fault segmentation, seismicity, and deformation rate of the Matano fault, Sulawesi, Indonesia

Patria,

Aulia,

Sabrian

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The Matano fault is one of the fast-slipping faults in Indonesia with a slip rate of ~20 mm/yr, accommodating the motion between the Pacific and Australian plates. The fault has remained unruptured at least for the past two centuries. Recent paleoseismological study suggested that the Matano fault has accumulated enough slip for the next surface-rupturing earthquakes. However, studies on the structures, seismicity, and deformation rate of the Matano fault are very scarce. This study characterizes the fault’s segmentation, evaluates the modern seismicity, and calculates the deformation rate of the Matano fault. The segmentation model of the Matano fault comprises eight major geometric segments, separated by structural discontinuities. Analysis of modern seismicity shows the high a- and b-value on the Matano fault, suggesting the high tectonic activity. Result of InSAR modeling also shows the rapid deformation on the Matano fault, reaching 39 mm/yr. Integrating our results suggest that the Matano fault can be divided into two major portions, separated by Lake Matano, that could rupture independently and produce Mw ≥7 earthquakes, possibly similar to the 2018 Mw 7.5 Palu earthquake. This study highlights the importance of comprehensive approaches for better understanding the active fault behaviors.

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Resistivity and Density Structure of Limboto Lake—Pentadio, Gorontalo, Indonesia Based on Magnetotelluric and Gravity Data

Susilawati

Niode²,

Surmayadi³

et al. 2023

Applied Sciences

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Limboto Lake—Pentadio area is located in the province of Gorontalo on the northern arm of Sulawesi Island, Indonesia, which experienced a tectonic process from the Sula Platform collision in the mid-Miocene. This tectonic process led to the westward subduction of the early Miocene and post-collision rifting and uplifting of the arc and subduction along the North Sulawesi Trench during the Late Miocene to the Quaternary periods. The rifting process of the North Sulawesi arc resulted in the formation of the Gorontalo graben zone in the W–E direction. There are geothermal surface manifestations near Limboto Lake, such as hot spring complexes, with temperatures ranging from 74.8 °C to 78.5 °C. To understand the geological structure and prospective geothermal characteristics beneath the investigated area, we performed integrated magnetotelluric and gravity surveys. The preferred 3D resistivity model confirmed the presence of a fault system and a graben system that was filled with conductive bodies (~1–15 Ωm) corresponding to alluvium deposits. This result was in accordance with the 2D density model inferred from the gravity data, where a low-density value indicates the presence of a graben zone. The conceptual model of Limboto Lake—Pentadio was constructed using the information from the MT and gravity results, and from the geological study. The conceptual model illustrates the geothermal system in Limboto Lake—Pentadio, which is controlled by the fault system and the Gorontalo graben system.

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Seismicity analysis Sulawesi North Arm based on B-Values

Cited by 3 publications

References 7 publications

Analisis Parameter Gempabumi Dengan Struktur Geologi Di Daerah Asparaga, Gorontalo

Analisis Parameter Gempabumi Dengan Struktur Geologi Di Daerah Asparaga, Gorontalo

Fault segmentation, seismicity, and deformation rate of the Matano fault, Sulawesi, Indonesia

Resistivity and Density Structure of Limboto Lake—Pentadio, Gorontalo, Indonesia Based on Magnetotelluric and Gravity Data

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