Nova Heryandoko

Meteorological Climatological and Geophysical Agency | BMKG · Center for Earthquake and Tsunami

A destructive shallow earthquake with a magnitude of 5.6 struck Cianjur, West Java, Indonesia on November 21, 2022. This earthquake resulted in 602 casualties and the collapse of over 67,504 residences. The day after the mainshock, we deployed 19 temporary seismic stations to monitor aftershocks for a period of 30 days. We manually picked arrival t...

Kalimantan and Sulawesi are located within the complex tectonic setting of central Indonesia. The tectonic evolution process during the Mesozoic and Cenozoic led to the formation of this region. Studies of Moho depth variation beneath this region are still limited due to the lack of local to regional scale seismic stations covering the entire Kalim...

Borneo and Sulawesi are two large islands separated by the Makassar Strait that lie within the complex tectonic setting of central Indonesia. The seismic structure beneath this region is poorly understood due to the limited data availability. In this study, we present Rayleigh wave tomography results that illuminate the underlying crustal structure...

Indonesia’s tectonic setting has resulted in a high level of seismic activity, which makes seismic networks and early warning systems vital for this country. Indonesia’s seismic stations, a total of 411 stations in 2021, are maintained by the Meteorological, Climatological, and Geophysical Agency (BMKG). This study attempts to evaluate station perf...

Western Java, part of the Sunda Arc, is an active tectonic region with high seismicity. The tectonic activity has produced active faults which are located near densely populated areas. On November 21, 2022, a significant earthquake rocked the Cianjur region, West Java, causing severe damage and loss of life. In this study we acquired aftershock dat...

Potential seismic hazards in the Sumatran Fault Zone (SFZ) have been highlighted as a consequence of significant earthquakes (MW ≥ 6.5). Fault geometry might control the initiation and propagation of rupture, which develops the importance of fault segmentation on the SFZ. In the last two decades, SFZ segments have been proposed through geological o...

A destructive earthquake (Mw 6.1) struck Pasaman, West Sumatra, Indonesia, on 25 February 2022, resulting in at least 18 deaths and damage to 1765 buildings. Our relocated foreshock, mainshock, and aftershocks and their source mechanisms reveal a previously unknown ~20 km long segment of the Sumatran Fault as a result of dextral strike-slip motion...

The Lembang Fault is located about eight km north of Bandung City, the capital city of the West Java province of Indonesia, with about 8.79 million people (dated 2020). Several studies state that the Lembang fault is an active fault with a maximum magnitude of 6.5 to 7. In terms of earthquake disaster mitigation, distinguishing characteristics of s...

From November 2015 to February 2016, seismic swarm activity occurred around Jailolo volcano, a long-dormant and few-studied volcano located on Halmahera Island, North Moluccas, Indonesia. We perform seismic ambient noise tomography method to delineate the sub-surface seismic structure beneath Jailolo volcanic complex. We use the vertical seismogram...

We apply a template matching detection to report a swarm-like foreshock sequence concentrated near the northern edge of the strike-slip fault rupture of the 25 September 2019 MW 6.5 Ambon earthquake in Seram, Indonesia. The template matching helps to identify small earthquakes that the routine earthquake catalog has not listed. The magnitude of com...

The 29 May 2017 Mw 6.6 Poso earthquake occurred in the eastern part of Central Sulawesi with a normal faulting mechanism, which is the largest normal earthquake to have occurred in the region since instrumental records have been available. Approximately 400 aftershocks were well-recorded by the Indonesian Agency for Meteorology, Climatology, and Ge...

On May 29, 2017, the MW6.6 Poso earthquake occurred in Central Sulawesi, Indonesia, causing moderate damages. The mainshock rupture and primary aftershock cluster occurred in the active Palolo-Sausu tectonic zone, and some aftershocks also took place around the Tokararu fault. However, the rupture mechanism of this earthquake and its relation to re...

Pulau Sulawesi dan Nusa Tenggara Timur (NTT) merupakan wilayah yang memiliki tatanan tektonik kompleks, sehingga penting untuk menggambarkan kondisi bawah permukaan wilayah tersebut. Metode Ambient Noise Tomography (ANT) digunakan untuk memahami struktur tektonik tersebut dengan mencitrakan struktur kerak atas di bawah area penelitian ini. Pada pen...

Mt. Jailolo is a B type volcano that has never erupted after 1600. Seismic activities around Mt. Jailolo have never been recorded until the swarm in November 2015. Several studies have been done to determine thecause of the swarm, but it is not certain whether the cause of the swarm is tectonic or volcanic activities. The study of attenuation chara...

Cimandiri Fault is one of major faults in West Java, which has a considerable potential hazard to the surrounding populated area. Therefore, it’s important to have a better understanding about the fault in order to improve disaster mitigation effort in Indonesia. This study is done to identify the Cimandiri Fault based on tomography earthquake data...

Gempa bumi tektonik 23 Januari 2018 berkekuatan M 6,1 telah mengguncang wilayah Lebak dan sekitarnya. Guncangan gempa bumi ini berdampak berrisiko yang cukup serius. Menjadi perhatian dari peristiwa ini adalah pusat gempa bumnyai berada di laut pada zona sesar Cimandiri sebagai kelanjutan dari zona sesar yang berada di daratan. Penelitian ini berha...

The source mechanisms of shallow tectonic earthquake Mw 5.6 on January 16, 2017 near Mt.Sibayak and Mt Sinabung was investigated by using moment tensor inversion. The result also compared by the field observation. We used waveform data from five BMKG station namely KCSI, PSI, LHMI, GSI, BKNI and one MY station namely IPM. Moment tensor inversion me...

Seismic swarms close to volcanoes often signal the onset of unrest. Establishing whether magma is the culprit and the unrest can be flagged as magmatic may be challenging. Here we analyze the spatio-temporal pattern of a seismic swarm that occurred in November 2015–February 2016 around Jailolo volcano, a long-dormant and poorly studied volcano loca...

Relokasi hiposenter gempabumi penting dilakukan untuk mendapatkan lokasi gempabumi dengan ketelitian yang tinggi, analisa pola tektonik, studi model struktur kecepatan, dan analisis seismisitas untuk studi global maupun studi lokal. Metode relokasi yang digunakan adalah metode teleseismic Double-Difference yang menggunakan model kecepatan seismik 3...

Sumatra was one of the most high seismicity regions in Indonesia. The subduction of Indo-Australian plate beneath Eurasian plate in western Sumatra contributes for many significant earthquakes that occur in this area. These earthquake events can be used to analyze the seismotectonic of Sumatra subduction zone and its system. In this study we use te...

Earthquake hypocenter relocation is need to be done to get a better earthquake location with high accuracy so tectonic setting, and seismicity analysis can be get and done for further studies. One of some method to relocate earthquake is teleseismic Double-Difference that used 3D velocity model. This research is done by relocating 7042 of 8845 avai...

All we analysed recording waveform of six seismograph stations which is part of CTBTO’s seismic network in Indonesia. The analysis using the spectral analysis method conducted to determine the characteristics response of each seismographic station. We analysed background noise level of sites using Power Spectral Density (PSD) and Probability of Den...

The energy of local and regional earthquake is usually expressed by local magnitude. In addition, local magnitude is also useful for seismic hazard assessment. The aims of this study are to determine the empirical formula of local magnitude and the correction distance function, -log A 0, applied for North Moluccas region. This study used waveform d...

The source mechanism of earthquake on July 2, 2013 was investigated by using moment tensor inversion. The result also compared by the field observation. Five waveform data of BMKG’s seismic network used to estimate the mechanism of earthquake, namely ; KCSI, MLSI, LASI, TPTI and SNSI. Main shock data taken during 200 seconds and filtered by using B...