Preface of destructive m&lt;5 earthquakes in Java island, 2015-2019

Julius, Admiral Musa; Daryono, -; Widana, I Dewa Ketut Kerta

doi:10.1088/1755-1315/708/1/012106

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…The results can be used as the preparation step to conduct manually picking by visual inspection. Moreover, the detection must be applied to figure more detail structure that may generate low earthquakes and make a massive ground shaking [20], [21].…”

Section: Resultsmentioning

confidence: 99%

A Preliminary Earthquake Detection from The Seismic Temporary Network in The Opak Fault

Simanjuntak

Saragih

Anshori

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Microseismic observation is a mandatory tool for analysing and imaging the progress of source earthquake mechanism. The observation of low-quality signal is usually found because of false detection, transient signals by natural noise, or related to seismometer condition and some human activities. Therefore, we try to figure the microseismic phenomenon after major earthquake in the Jogjakarta fault that was generated by an active fault namely Opak Fault. We used the seismic data recording from the seismic project that was installed in 2006 cover the Jogjakarta region. We used one week data to see the potential detection and highlight the possible of positive or negative false detection. With total 16 stations, we got ~500 events in only one week recording. We used a various threshold with 110 to scan all the dataset and we obtained ~450 events with 50-100 events with possible of false positives. Meanwhile, the threshold of 112 has < 50 events that could be suitable with the waveforms. The example results of 120 thresholds figure a strong event that is located by highly resolution of stack coherent from some stations with precise of P and S phase fitting. This study present the first automatic earthquake locations that can provide more detail of seismic structure information in the Jogjakarta region.

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Section: Resultsmentioning

confidence: 99%

A Preliminary Earthquake Detection from The Seismic Temporary Network in The Opak Fault

Simanjuntak

Saragih

Anshori

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…This area has several active faults, such as Cimandiri, Lembang, and Baribis Faults [1]. This region has also been hit by major earthquakes, which caused building damages [2] [3], and some of those cases are followed by tsunami [4] [5]. This research area is also one of the most populated regions in Indonesia, consisting of West Java and Banten Province.…”

Section: Introductionmentioning

confidence: 99%

Love Wave Group Velocity Extraction Using Ambient Noise Tomography in West Java, Indonesia

Luthfiyani¹,

Rosalia

Yudistira

et al. 2022

J. Phys.: Conf. Ser.

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West Java, Indonesia, is located in the northern part of the subduction zone between the Australian and Eurasian plates, with a complex tectonic setting and high seismicity level. In 2016, Institut Teknologi Bandung (ITB) and Australia National University (ANU) deployed 85 temporary seismometers to investigate this area. We constructed the shallow crust profile by applying the Ambient Noise Tomography (ANT) method to improve our knowledge of the tectonic condition in West Java. In this research, we used the north-south (NS) and east-west (EW) components to extract the Love waves Green’s function. We first rotated the NS and EW daily data series to obtain the transverse component. We then pre-processed the transverse daily data and applied cross-correlation to all station pair data. The daily cross-correlated data is stacked to obtain the Love waves Green’s function. The Green’s function in this study is clearly seen in the 1-25 s period band. The obtained Green’s function will be analyzed further to get the Love waves group velocity which then will be inverted to obtain the shear wave velocity (Vs) profile beneath the study area.

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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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Preface of destructive m<5 earthquakes in Java island, 2015-2019

Cited by 6 publications

References 14 publications

A Preliminary Earthquake Detection from The Seismic Temporary Network in The Opak Fault

A Preliminary Earthquake Detection from The Seismic Temporary Network in The Opak Fault

Love Wave Group Velocity Extraction Using Ambient Noise Tomography in West Java, Indonesia

Understanding swarm earthquakes in Southeast Aceh, Sumatra

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