Supriyanto Rohadi

• Doctor of Philosophy
• Head of Department at Meteorological Climatological and Geophysical Agency

Accurate and timely earthquake magnitude estimation is critical for effective tsunami early warning, particularly in seismically active regions like Indonesia. Conventional seismic approaches often suffer from magnitude saturation for large events (Mw > 7.5), leading to underestimated magnitudes. To address this limitation, we propose a novel Peak...

Earthquake observation station data quality analysis is very important as quality control. However, the determination of the quality of earthquake observation stations is currently still done manually by analyzing several existing parameters by an expert. In this study, a deep learning method approach is proposed to classify the quality of earthqua...

The Palu-Koro fault, part of the Central Sulawesi fault system, has produced many large earthquakes (Mw > 6). Palu earthquake on 18 August 2012 (Mw 6.3) which occurred close to the largest earthquake ever recorded in Central Sulawesi, the Donggala earthquake on 28 September 2018 (Mw 7.5), also caused notable damage around Palu, the capital of Centr...

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...

Micrometer Array measures microwaves from nature and human life by using specific configurations to determine the rock layers below the surface. The purpose of this study was to obtain information on subsurface geological conditions, especially rock layers and the depth of bedrock so that the characteristics of underground rocks and soil conditions...

Analysis of the data quality of earthquake observation stations becomes very important as quality control. However, determining the quality of earthquake observation stations is done manually by analyzing several existing parameters by an expert. This study proposes a deep learning method approach to classify the quality of earthquake observation s...

The BMKG earthquake catalog data for the 2014-2022 period shows seismic activity in the Gumai Mountains, South Sumatra, which is located southeast of the Ketaun Segment, east of the Musi Segment, and north of the Manna Segment. Seismic activity in this area is important to study as an early indication of the presence of other active fault segments...

Good quality seismic data is needed to produce accurate earthquake information, namely seismic data with low background noise. A reliable monitoring and evaluation system are necessary to determine the quality of seismic stations in recording earthquake waves quickly and accurately. The Seismic Station Quality Monitoring and Evaluation System (SQES...

Aluvium merupakan fitur geologi yang memiliki sifat rentan terhadap pengaruh gempabumi. Daerah Porong dan sekitarnya tempat semburan Lumpur Sidoarjo (Lusi) terjadi merupakan daerah dataran yang ditutupi oleh endapan aluvium Delta Brantas, sehingga daerah ini merupakan zona lemah yang rentan terhadap pengaruh gempabumi. Hal ini diperkuat dengan adan...

The MiniSEED or signal data transformation stages in this study can be illustrated through the diagram in Figure 5. The initial stages of time domain waveform data are divided into several frames; frame blocking blocks help facilitate calculations and signal analysis, and in the process of frame blocking, time domain data is changed. Into several f...

The Central and East Java region, which is part of the Sunda Arc, has relatively high seismic rates due to the convergence of two major tectonic plates in the Indonesian region; i.e., the Indo-Australian Plate subducting under the Eurasian Plate. Many devastating earthquakes have occurred in this area as a result of the interaction between these tw...

Conventional seismic sensors, may have some problems, for example, seismometers are vulnerable to clipping and going off-scale when recording in the near-field of large earthquakes, that caused magnitude saturation. High-rate GNSS measurement can avoid the problems in conventional seismic records, in determining true size of large earthquake. The M...

Ambon is an area that often experiences large earthquakes, such as September 26, 2019, M:6.5, which resulted in 30 deaths and injured 156 people with significant material losses. Plus, yesterday, an earthquake followed by a small tsunami on June 16, 2021 M:6.1. This sudden and unexpected earthquake indicates that Ambon is very active in its tectoni...

The Lembang Fault is an active fault located in the northern part of the Bandung Basin. Even though it is included in the category of active fault, until now there has been no energy release activity in the form of an earthquake with a very large strength. This study aims to map the level of activity of the Lembang Fault based on the concentration...

We propose calculating the earthquake return period based on statistical approaches and the properties of plate convergence at Java Trench. The tectonic characteristic can be known from the b-value and the number of earthquakes is represented by the a-value found in the Gutenberg-Richter law. The return period is calculated base on a statistical ap...

Learning from Tasikmalaya earthquakes on December 15, 2017 and September 2, 2009, seismic hazard analysis of surface level in Tasikmalaya City become important to do. This study presents seismic hazard estimation of Tasikmalaya City in terms of maximum ground acceleration (PGA) and spectral acceleration at surface level. The latest seismicity data...

The Molucca Sea Plate, and Sangihe and Halmahera plates have a complex tectonic setting and interact to create the Molucca Sea Collision Zone. We re-picked 1647 events recorded from 2010 to 2017 from 32 of The Agency for Meteorology, Climatology, and Geophysics (BMKG) stations and obtained P- and S-arrivals of ~17,628 phases. Hypocenter locations w...

Meteorological, Climatology and Geophysics Agency (BMKG) is the agency responsible for providing information on earthquake parameters in Indonesia. BMKG has installed 411 seismometers network spread across Indonesia, this network is known as the Indonesia Tsunami Early Warning System (InaTEWS) network. The dense distribution of the seismometer is e...

This study’s research aim has been to clearly reveal the geometry of the Molucca Sea Plate subduction zone beneath Sulawesi’s north arm, the relationship between the subduction zone and volcanic activity in Halmahera, and analyze the depths of the upper arch of the double subduction of the Molucca Sea Plate. The use of travel time tomography made i...

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...

The Palu earthquake on September 28, 2018 with a magnitude of Mw 7.5 was one of the most destructive earthquakes in Indonesia. This earthquake also caused an underwater avalanche and caused a tsunami along the coast of the Palu bay. The source of the earthquake was the tectonic activity of the Palukoro fault. Until now, several research methods on...

Micrometer Array is a field observation that uses surface waves with certain configurations. The purpose of this research is to obtain information on subsurface geological conditions, especially the depth of the bedrock so that the subsurface rock characteristics and soil conditions can be identified as landslide mitigation measures in the Curug Pe...

Wilayah Jawa memiliki aktivitas seismik yang tinggi akibat terletak di zona subduksi serta keberadaan beberapa sesar di daratan. Wilayah Jawa juga memiliki jumlah penduduk dan pertumbuhan infrastruktur tertinggi, sehingga upaya mitigasi harus dilakukan untuk mengurangi risiko gempa. Langkah paling penting untuk mengatasi hal tersebut adalah dengan...

Wilayah Jawa memiliki aktivitas seismik yang tinggi akibat terletak di zona subduksi serta keberadaan beberapa sesar di daratan. Wilayah Jawa juga memiliki jumlah penduduk dan pertumbuhan infrastruktur tertinggi, sehingga upaya mitigasi harus dilakukan untuk mengurangi risiko gempa. Langkah paling penting untuk mengatasi hal tersebut adalah dengan...

The Central and East Java region, which is part of the Sunda Arc, has an important role in producing destructive earthquakes and volcanic complexes in Indonesia as a result of the convergence between the Indo-Australian plate that subducts under the Eurasian plate. In this study, the 3-D seismic velocity structure (Vp, Vs, and Vp/Vs) of the crust a...

The earthquake focal mechanism is one of the essential parameters in understanding the characteristics of an earthquake source. For example, the earthquake mainshock at the Padang Lawas Regency and South Tapanuli Regency on April 30, 2020, caused some damage to houses, schools, and mosques, especially in the South Tapanuli Regency. BMKG released th...

ABSTRACT. Hypocenter relocation is important to obtain accurate earthquake locations for detailed tectonic structure studies, such as identification of fault plane patterns, subduction zone patterns, and plate boundary identification. One of the newest hypocenter relocation methods is the teleseismic Double-Difference (teletomoDD) method which uses...

Banjar is one of the important cities in West Java Province which is prone to earthquakes. Seismic hazard analysis is very important and needed to support the development and reduce earthquake risk in the city. Thispaper describes the use of Hybrid GMPE in Probabilistic Seismic Hazard Analysis which applied to Banjar City. The research aims to prov...

A destructive earthquake occurred around the Opak Fault, Yogyakarta on May 27th, 2006 with a magnitude of Mw 6.3. As a mitigation effort, BMKG observes physical and chemical parameters by installing earthquake precursor parameter sensors at Pundong and Piyungan Stations, Yogyakarta. Precursor parameter data (radon, air temperature, geotemperature,...

Earthquake swarms commonly come approximately active tectonic and volcanic area. Interestingly, the swarm events occurred ~23 km southwest from Mt. Salak-Bogor, West Java, Indonesia, from August 10 to November 24, 2019, and were recorded by local/regional network of the Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG). Our prev...

Molucca Sea collision zone is a region which has very complex geology and tectonic setting, producing high seismicity and volcanoes activities. In this study, we have determined hypocenter location around the region using local & regional network of Agency of Meteorology, Climatology, and Geophysics, Indonesia (BMKG). We used 1,647 events that reco...

Indonesia has a high level of seismic vulnerability because located in the junction area of four large plates, namely the Eurasian plate, Indo-Australian plate, Pacific plate, and Philippine Plate, and also the number of active faults that stretch throughout its regions. One of the efforts to mitigate earthquake disasters is to conduct seismic haza...

Seismic vulnerability index is one of the key factors in mitigation that shows the vulnerability of the soil layer beneath when passed through with a wave, the more vulnerable the soil layer, the more damage it done when an earthquake happens. Seismic vulnerability is calculated using two variables, that is dominant frequencies and amplification th...

On September 26, 2019, an earthquake (Mw 6.5) occurred in the northern part of Ambon Island, Molucca, East Indonesia. The National Authority show this earthquake caused infrastructures damage and 28 fatalities. Up to October 31, 2019, the Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG) seismic network had recorded 479 aftersho...

The area of Ambon, Maluku is located in the subduction zone in bands where the Australian plate meets the Eurasian plate, thus causing tectonic activities. The Ambon earthquake on 26th September 2019 with 6.5 Magnitude, while the Epicentral coordinates of the earthquake were determined as 3,53° S and 128,39° E and a focal depth of 10 km, according...

In the last few years BMKG (Agency for Meteorology Climatology and Geophysics) has increased the number of seismic stations significantly. Until mid-2020, when this study was conducted, the number of BMKG stations has reached 339 units. Development of the network is aimed to improve the data quality, speed of earthquake data processing and informat...

Travertine is a geothermal surface feature that forms by the deposition of carbonate from discharging supersaturated thermal bicarbonate fluid. This study was conducted to determine travertine rocks mineralogy found in Cisolok geothermal area, Sukabumi, West Java. Petrographic, diffraction, and elemental analysis were performed on several recent an...

Gunung Lawu is one of the areas that have geothermal potential in Indonesia. One way to find out if an area has a geothermal potential is to know the alteration that occurs in the rocks in that area. Alteration is a very complicated process that involves changes in mineralogy, chemistry, and texture caused by the interaction of hot fluids with the...

We have investigated shear wave splitting using seismograms from 23 broadband stations of BMKG along Central and East Java, Indonesia, recorded from January 2009 to September 2017 with the clear onset of local S phases and constrained it to the criteria of crustal anisotropy study, i.e. event depths less than 30 km with radius 100 km from each reco...

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...

The Regency of Pangandaran is located on the southern side of West Java, surrounded by local faults, and close to the Indo-Australia and Eurasian subduction zone, causing the area to feel the earthquake’s impact often. Tasikmalaya Earthquake M 7.3, on September 2, 2009, was felt strong and has caused damage in this area. Therefore, mitigation effor...

We present here an analysis of the destructive Mw 6.2 earthquake sequence that took place on 14 January 2021 in Mamuju–Majene, West Sulawesi, Indonesia. Our relocated foreshocks, mainshock, and aftershocks and their focal mechanisms show that they occurred on two different fault planes, in which the foreshock perturbed the stress state of a nearby...

Research to find out intrusion in Pangandaran is very interesting, because this area is close to coastal objects that has been expanding and leading tourist attraction in West Java, Indonesia. This intrusion information is useful to determine aquifer locations which indicate below that the location is saturated water. If this aquifer locations are...

The M 8.3 Sumba Earthquake occurred on August 19, 1977. Data from the National Center for Earthquake Studies (PuSGeN, 2017) shows that the Sumba Megathrust Segment has a potential earthquake with a maximum magnitude of 8.9. Sumba Island is one of the tourism sites for domestic and foreign tourists, so it needs disaster mitigation. As the first miti...

Ambon earthquake (Mw 6.5) occurred on September 26, 2019, has an almost identical location with the earthquake which occurred on September 09, 1932. Accordingly, the authors considered that the return period (Tr) of the earthquake takes 87 years. Along the interseismic period, there were stress accumulation processes related to the earthquake (Mw 6...

A seismogram is a combination of several important information, namely source effects, path effects, and site effects. The location effect provides initial information about the amplification of the receiving station's soil layer response in the event of an earthquake. This study aims to obtain site effect information by analyzing spectrum seismogr...

Sunda trench is stretched from Andaman Island past the southern coast of Sumatra extend to southern Java and around East Nusa Tenggara and became the source of some significant earthquakes. Those earthquakes were Aceh M9.2 December 2004, Pangandaran M7.7 July 2006, and Flores M7.7 December 1992. Therefore, the awareness and preparedness toward seis...

On July 7, 2019, an earthquake occurred beneath the Molucca Sea. The BMKG said the magnitude seven quakes at a depth 36 km. The next day, aftershocks occurred continuously. This data indicates that the Maluku Subduction Zone always moves dynamically, so it needs to be aware of the potential significant earthquake that can generate a tsunami in this...

Garut is a regency that closely adjacent to the capital of the West Java Indonesia province, Bandung. This position makes Garut functioning as satellite and hinterland to some big cities near Jakarta, Indonesia's capital. Infrastructure projects in this area continuously grow to support the development and uprising of the economic index. On the oth...

Efforts to reduce the impact of earthquake disaster have been made by the government, continuously. To decrease the casualties, an effort to be done is to construct housings and public infrastructures following the earthquake-resistant role or building code, especially in cities with high vulnerability and population. For this reason, an earthquake...

Earthquake precursors continue to be developed by researchers to try to predict earthquakes, one of which is Radon. The monitoring of radon gas in the ground continues to be carried out in Yogyakarta and its surroundings as one of the earthquake mitigation efforts. This study aims to analyze the variation of radon gas and seismic activity as well a...

Gempa bumi Banten berkekuatan 6,2 Mw pada tanggal 23 Januari 2018 menarik perhatian para ahli tentang pentingnya pengetahuan mengenai percepatan tanah maksimum dan spektra percepatan di permukaan untuk wilayah DKI Jakarta. Hasil PGA M , S MS , dan S M1 memegang peranan penting dalam peraturan desain seismik. wilayah DKI Jakarta. Hasil PGA M , S MS...

Travertine deposits are carbonate rocks consists mainly of calcium carbonate minerals, supersaturated from bicarbonate-rich water. Both recent and fossil travertine deposits are found in Ciseeng geothermal field, West Java. The travertine deposits are distributed around three distinctive areas Tirta Sayaga, Mount Panjang and Mount Peyek. This study...

Gunung Endut located in Lebak, Banten is one of the prospected areas of geothermal energy resource on the island of Java, Indonesia. The presence of clay mineral in the surface can help to determine the hydrothermal fluid temperature circulating in Gunung Endut. Based on the collected samples, petrography analysis revealed the presence of clay mine...

Currently, the GNSS has grown rapidly and is widely applied for commercial and research purposes, one of which is an earthquake precursor. Precursor detection of major earthquakes using TEC in the ionosphere has recently become a promising method. This paper focuses on investigating TEC inconsistencies before major earthquakes in the North Maluku r...

Radon gas concentration anomalies before the occurrence of earthquakes have been detected in many major earthquake cases in the world, so they can be considered as early signs or earthquake precursors. The BMKG has installed a radon gas concentration measuring device equipped with gauges of air pressure, air temperature, and rainfall around the Pal...

On December 15, 2017, and January 23, 2018, there were destructive earthquakes to the south of West Java, Indonesia, with Mw 6.9 and Mw 6.1, respectively. We have determined the hypocenter location for both mainshocks through re-picking of the P-and S-wave arrival times recorded by the Agency for Meteorology, Climatology, and Geophysics (BMKG) seis...

The Central and East Java region, which is part of the Sunda Arc, has relatively high seismic rates due to the convergence of two major tectonic plates in the Indonesian region; i.e., the Indo-Australian Plate subducting under the Eurasian Plate. Many devastating earthquakes have occurred in this area as a result of the interaction between these tw...

We carried out a tsunami simulation of the 2011 (Mw 9.0) Tohoku earthquake. We analyze the tsunami run-up modeling by applying additional variables to seismic moment and moment magnitude equation to find out what extent it affects of sub-faults strike direction and landslide energy to tsunami propagation. To investigate the accuracy of run-up and i...

High seismicity rates in and around West Java occur as a result of the Indo-Australian plate converging with and subducting beneath the Sunda plate. Large megathrust events associated with this process likely pose a major earthquake and tsunami hazard to the surrounding community, but further effort is required to help understand both the likelihoo...

The great paleo-megathrust earthquake occurred in west Bengkulu-Sumatra on November 25, 1833 and it was estimated to have the magnitude of about Mw 8.6–9.1. This earthquake triggered a tsunami that has 3-4 m height in the Bengkulu coastal and its vicinity. The fundamental earthquake parameter was not known exactly, thus it was difficult to conduct...

In 2018, Lombok Island was hit by a major earthquake sequence. The Indonesia Meteorological, Climatological, and Geophysics Agency (BMKG) reported that the Lombok Island earthquake sequence started with an Mw 6.4 foreshock, followed by an Mw 6.8 main shock, aftershocks of Mw 5.8 and Mw 6.2, and a second mainshock of Mw 6.9 in the eastern part of Lo...

Central Sulawesi has very complex tectonic conditions, and therefore the earthquake hazard of the region needs to be carefully examined. One of the required components to develop such examination is regional ground motion prediction equations. This study describes the development of GMPEs for Central Sulawesi based on broadband velocitymeter and st...

Penelitian ini bertujuan untuk 1) mengetahui pengaruh komposisi media tanam terhadap pertumbuhan dan hasil tanaman kailan, 2) mengetahui pengaruh dosis pupuk nitrogen terhadap pertumbuhan dan hasil tanaman kailan, 3) mengetahui pengaruh kombinasi komposisi media tanam dan dosis pupuk nitrogen terhadap pertumbuhan dan hasil tanaman kailan. Penelitia...

South Sumatra basin is one of the back arc tertiary basin in western part of Indonesia. It consists of 31 grabens and 2 grabens complexes which are divided into three general basin systems. Modeling of maturity generation has been performed in Jambi sub basin with Talang Akar formation as source rock target from 5 well along in HL field. This study...

Gunung Endut, located in Banten Province, has geothermal pr ospect area in its mountain slope. Some of the area of Gunung Endut has limestone facies which commonly deposited in marine environment. Based on the regional geological map of Leuwidamar, limestone facies are the member of Bojongmanik Formation within the Bogor Physiographic Zone. In Gunu...

Mount Endut is a volcano located in the eastern part of Banten Province. Previous studies revealed that Mount Endut consists mainly of Quaternary volcanic and Tertiary plutonic igneous rocks respectively. This research focuses on the petrology of igneous rocks found in the southern region of Mount Endut in order to determine the type of igneous roc...

Ground subsidence on urban area are one of the major factors of disaster. in urban area such as Jakarta, ground subsidence is frequently occurred on main road and densely populated building. Study of surface elevation changes due to influence of groundwater movement have broadly discussed. In Many areas of subsidence caused by groundwater pumping h...

Implementation of anisotropy value in seismic data processing greatly affect seismic cross section image. In addition to enhanced seismic imagery, anisotropy can be used for identification of hydrocarbons. In this study, the vertical transverse isotropy (VTI) anisotropy parameter estimation by the VVO method has been done. The magnitude of the velo...

Hydrothermal alteration is a great indicator of thermal fluid dynamics, especially in a geothermal system. Hydrothermally altered minerals are formed based on temperature and the properties of the protolith. Hydrothermal alteration samples from Gunung Endut Geothermal Working Area were analysed using petrography methods. Importance in determining t...

Ciseeng geothermal field is located Northwest of West Java 40 km from Jakarta. Three surface manifestations are in Tirta Sayaga, Panjang Mountain, and Peyek Mountain. This study aims to build a hydrogeochemical model based on water analysis. The secondary regional geological data are retrieved to complete geological information of Ciseeng. The rese...

Banten region is known to have subvolcanic hydrocarbon system but no proven play despite oil seeps and the potential source rock have been identified in this area. A Geochemical analysis of source rock have been done on Gunung Endut, Banten Province. There are four coaly shale sample from Genteng Formation and Bojongmanik Formation collected and an...

Remote sensing has become one of the most used methods in geothermal exploration. This technology is used to detect the presence of lineaments located in the area of geothermal exploration. The lineament can be expressed in the form of ridges and valleys. These features are closely related to the existence of geological structures. Geological struc...

Hydrothermal alteration is an interaction between rock and hydrothermal fluid by means changing the mineralogical composition of the rock. This process is controlled by permeability, chemical composition, temperature, pressure, and duration of the hydrothermal alteration. Gunung Pancar, located in West Java, is considered an outflow for Gunung Gede...

The WR field in this study is a gas hydrocarbon proven field with high saturation rate and reservoir character in tight sandstone. There are prestack 3D seismic data and three well data that have P-wave velocity (Vp) and S-wave velocity (Vs). In its development there are three kind of methods using Vp, Vs, and angle function constants that is Exten...

Focal mechanism study was carried out on 5 major earthquakes that occurred in Lombok on July-August 2018. The KIWI program was applied here to compare the parameters of the 5 earthquake sources. The principle of the KIWI program is inversion of wave components at various stations to obtain the moment tensor. Green’s Function is also implemented to...

Lombok and Nusa Tenggara are one of the regions in Indonesia that have quite complex tectonic arrangements. With this order, not infrequently in the region there are often natural disaster phenomena. One of the most striking things is the occurrence of a series of earthquakes of magnitude Mw > 5.0 that rocked the northern region of the Island of Lo...

Indonesia is actually located in collisions between three large plates of Eurasia, Indo-Australia, and Pacific. It causes earthquakes to occur frequently in several regions, one of which occurs sequentially the 5 big shocks in Lombok in period of July-August 2018. There is a Flores thrust fault in the North of the Lombok Island region. The objectiv...