Correlation Equation of Fault Size, Moment Magnitude, and Height of Tsunami Case Study: Historical Tsunami Database in Sulawesi

Julius, Admiral Musa; Pribadi, Sugeng; Muzli, Muzli

doi:10.1088/1755-1315/132/1/012012

Cited by 6 publications

(3 citation statements)

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“…During the initial stages of the tsunami, there is a process of sea level fluctuation, involving both uplift and subsidence (vertical displacement). When the oceanic plate undergoes a rapid uplift process following a megathrust earthquake, it leads to significant fluctuations in the mass of water from the ocean floor to the sea surface [11]. Shallow earthquake sources with substantial force release a vast amount of energy that displaces the water mass above them, resulting in increasingly significant vertical displacement differences [12].…”

Section: Initial Conditions (Source Modeling)mentioning

confidence: 99%

“…The initial condition of sea level immediately after the earthquake occurred was a sea level change of -4.599 m to 7.019 m Figure 5 illustrates the maximum value, representing the vertical movement process in the rising oceanic crust. Conversely, the minimum value indicates a decrease in the oceanic crust's elevation.When the oceanic plate undergoes a rapid uplift process following a megathrust earthquake, it leads to significant fluctuations in the mass of water from the ocean floor to the sea surface[11]. Shallow earthquake sources with substantial force release a vast amount of energy that displaces the water mass above them, resulting in increasingly significant vertical displacement differences[12].…”

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Preliminary study of tsunami simulations on megathrust earthquake scenarios in Pacitan Regency, East Java

Widodo,

Aditama,

Rochman

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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During the period 1600 to 2007 there have been approximately 109 tsunamis in Indonesia with 90% caused by tectonic earthquakes. Pacitan located in an east java segment subduction area which is very prone to earthquakes and tsunamis. The coastal morphology of Pacitan has great potential for tsunami hazard. This research is focused on conducting numerical modeling of the tsunami generated by the hypothetical megathrust earthquake in the East Java segment with a magnitude of Mw 8.7. The method used is Cornell-Multi Grid Coupled applied shallow water equation with COMCOT 1.7 software. The nested grid system uses 4-layer consisting of 1-layer GEBCO, 2-layer bathymetry, and 1-layer integration of bathymetry and topography to produce tsunami modeling with high resolution. The results showed that the megathrust hypothetical earthquake scenario for the East Java segment caused a vertical displacement at sea level of -4.599 m to 7.019 m. The tsunami propagation northwards towards the Pacitan coast had a maximum amplitude of 33.16 m with a travel time of 23 – 29 minutes and then spreads in all directions. The farthest inundation range occurred in Pacitan Subdistrict as far as 4.189 km to the north of Ranuharjo Beach, while the maximum run-up of 21.82 m occurred in Soge Beach, Ngadirojo Subdistrict. The farthest affected area of inundation occurs on a gently sloping morphology with a slope of 0-8%, the highest run-up is on a moderate to steep sloping morphology with a slope of more than 25%. The results of tsunami simulation can be used for planning tsunami disaster mitigation in Pacitan.

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Section: Initial Conditions (Source Modeling)mentioning

confidence: 99%

mentioning

confidence: 99%

Preliminary study of tsunami simulations on megathrust earthquake scenarios in Pacitan Regency, East Java

Widodo,

Aditama,

Rochman

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…Luas bidang patahan dan magnitudo momen gempa adalah parameter sebab-akibat. Oleh karena itu, wajar bila penelitian terdahulu (Wu et al, 2013;Konstantinou, 2014;Goda et al, 2016;Thingbaijam et al, 2017;Julius et al, 2018) membahas topik rupture area-moment magnitude scaling relationship dalam bentuk persamaan empiris 𝑀 w sebagai fungsi logaritmik 𝐴 yang bisa diperoleh dari data statistik gempa. Dimensi patahan ditentukan dari hasil pemodelan sumber, misalnya kasus gempa tektonik di luar Indonesia (Yen and Ma, 2011;Murotani et al, 2015;Irikura et al, 2017) dan yang terjadi di wilayah Indonesia (Ratnasari et al, 2020;Salman et al, 2020).…”

Section: Pendahuluanunclassified

Analisis Relasi Antara Magnitudo Momen Gempa Dan Luas Bidang Patahan Sumber Gempa

Ayudia

Prastowo

2020

IFI

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Abstrak Upaya mitigasi bencana geologi khususnya gempa tektonik di Indonesia dapat dilakukan dengan mempelajari relasi antara parameter gempa dan sumber gempa. Parameter ukuran kekuatan gempa adalah magnitudo sedangkan parameter sumber gempa adalah dimensi patahan yang meliputi luas dan kedalaman bidang patahan. Dalam hal ini, magnitudo gempa diukur dalam skala magnitudo momen dan dimensi patahan direpresentasikan rupture area (merupakan perkalian antara rupture length dan rupture width ) dan rupture depth . Fokus penelitian ini adalah relasi antara dan serta mempelajari kemungkinan peran rasio dan . Data penelitian adalah 53 data gempa sebagai data utama dan data tambahan dari kasus gempa di luar negeri dan di Indonesia yang diakses bebas melalui laman http://eida.gfz-potsdam.de/webdc3 atau https://earthquake.usgs.gov/earthquakes/search/. Mayoritas data utama merupakan gempa tipe strike-slip atau normal dengan kekuatan 4,5 ≤ ≤ 7,6 yang relevan dengan tektonik Indonesia. Hasil-hasil penelitian berupa persamaan empiris = 0,50 ln + 3,56 dan terapan persamaan empiris tersebut untuk estimasi magnitudo gempa di dalam dan luar Indonesia. Untuk seluruh kasus, penyimpangan estimasi magnitudo relatif terhadap magnitudo referensi adalah ≤ 0,1 dengan standar deviasi pengukuran 0,2 (dianggap tidak signifikan). Meskipun penelitian ini belum berhasil mengungkap korelasi antara dan dua parameter patahan dan , namun persamaan empiris temuan penelitian menunjukkan ada korelasi kuat antara magnitudo momen dan luas bidang patahan berupa sebagai fungsi logaritmik yang konsisten dengan temuan penelitian terdahulu. Hasil-hasil penelitian ini diharapkan bisa meningkatkan pemahaman tentang karakteristik gempa tektonik di Indonesia. Kata Kunci: magnitudo momen, luas bidang patahan, dimensi patahan Abstract Efforts in mitigation study for geohazards risk reduction in particularly Indonesian earthquakes were examined using scaling relationship between source and earthquake parameters. Magnitude was a measure of earthquake size and fault dimensions was used as source parameter including rupture area and depth. In this context, earthquake size scaled with moment magnitude and fault dimensions were represented by rupture area (the product of rupture length and width ) and depth . The focus of this study is to develop scaling relationship of and as well as to examine possible roles of ratio and the depth . The data were 53 earthquakes as the primary data and addditional cases obtained from occurences both in overseas and Indonesian territories, accessed at http://eida.gfz-potsdam.de/webdc3 or https://earthquake.usgs.gov/earthquakes/search/. The majority of the main data was associated with normal or strike-slip events ranging 4.5 ≤ ≤ 7.5, relevant to Indonesian settings. The results are empirical equation = 0.50 ln + 3.56 and its application to estimate magnitudes for cases in and outside Indonesia. For all cases considered in this study, magnitude estimates were ≤ 0.1 relatively compared with references with standard deviation of the measurements of only 0.2, considered unimportant. Although this study has not unrevealed correlation of and parameters and , the equation shows that the magnitude and the area are strongly correlated, namely is a logarithmic function of , consistent with previous work. The results contribute better understanding of characteristics of Indonesian earthquakes. Keywords: moment magnitude, rupture area, fault dimensions

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Understanding swarm earthquakes in Southeast Aceh, Sumatra

et al. 2022

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The cause of the swarm earthquakes occurring from September until November 2020 remains unclear. The swarm activities are close to the Tripa active fault but also close to Mt. Bendahara. This study offers the analysis of seismic P and S wave arrivals and relocate the hypocenter of the swarm. We analysed the hypocentre distribution that recorded by Badan Meteorologi Klimatologi dan Geofisika (BMKG) from July 2020 to January 2021. The arrival of P and S-wave from 103 events was used obtain 1-D seismic velocity model. The earthquake used for this study consisted of at least 6 phases of seismic arrivals with the azimuthal gap angle less than 180 degree. The different velocities occurred in the upper and lower of the crustal thickness of 0 – 40 km. The Vp values are about 5.0 – 7.0 km/s and 3.0 – 5.0 km/s for Vs value while the Vp/Vs ratio are ranging from 1.5 to 1.7. Our preliminary results indicate that the potential swarm activities near to Mt. Bandahara maybe triggered by an unknown fault activity as no volcanic activity was reported.

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Correlation Equation of Fault Size, Moment Magnitude, and Height of Tsunami Case Study: Historical Tsunami Database in Sulawesi

Cited by 6 publications

References 1 publication

Preliminary study of tsunami simulations on megathrust earthquake scenarios in Pacitan Regency, East Java

Preliminary study of tsunami simulations on megathrust earthquake scenarios in Pacitan Regency, East Java

Analisis Relasi Antara Magnitudo Momen Gempa Dan Luas Bidang Patahan Sumber Gempa

Understanding swarm earthquakes in Southeast Aceh, Sumatra

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