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Focal Mechanism and Parameter of Volcano-Tectonic Earthquake Source, in Mount Guntur, West Java Hidayati, Sri; Suparman, Y.; Loeqman, A.
Indonesian Journal on Geoscience Vol 6, No 1 (2011)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2123.629 KB) | DOI: 10.17014/ijog.v6i1.111

Abstract

DOI: 10.17014/ijog.v6i1.111Guntur Volcano in West Java is one of the most active volcanoes in Indonesia. The last eruption took place in 1847 and the volcanic activity has been dormant since then, however its seismicity is active. During the period of July to October 2009, the hypocenter distribution of VT earthquakes is mostly located at western flank of the volcano, beneath Guntur - Gandapura craters at the depth of less than 5 km. The depth pattern shows deeper to the northwest. The VT earthquakes deeper than 5 km were not found in this period. The focal mechanism of VT earthquakes are oblique normal fault, strike-slip fault and oblique reverse fault types. The mechanism of those earthquakes is not uniquely determined probably due to complicated structures at Guntur volcano complex area, which is aligned in NW-SE direction. T-axis of the oblique normal fault is trending in northwest - southeast direction similar to the structures found in the summit area of Gunung Guntur Volcano. Similarly, one of the strike-slip fault nodal line and P-axis of oblique reverse fault are also trending in northwest - southeast. Ploting of the earthquake source parameters (seismic moment, corner frequency, and stress drop) made to hypocenter distance shows no significant difference on those parameters between earthquakes at close and far distances to Kabuyutan station. It is probably due to the hypocenters are not concentrated in one zone. Meanwhile, the relationship between seismic moment (Mo) and seismic source radius (r) shows that for earthquakes with moment of smaller than 1018 dyne cm, the radius of the hypocenter is constant which is namely 60 m.
Pengaruh Gempabumi Tektonik Terhadap Aktivitas G. Gede Hidayati, Sri; Sulaeman, Cecep; Supartoyo, Supartoyo; Kriswati, Estu
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 4 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

In addition to home for seven active volcanoes, West Java, is also having high tectonic activity, owing to its close distance from subduction zone and crustal fault. The Cimandiri Fault extends about 100 km from southwest to the northeast ward through Sukabumi area. Gede Volcano with high seismic activity is sitting 20 km north of Cimandiri Fault. Shallow earthquakes often occur around Gede volcano and their sources are fairly close to the Cimandiri valley. Feltearthquakes occurred in 2007, 2010, 2012 and 2014,where the source supposed to be around Cimandiri valley,were followed by volcano-tectonic (VT) earthquake swarms in Gede Volcano. These swarms probably indicate that there is a linkage between tectonic and Gede volcano activities. However, the swarms were followed by less significant changes in volcanic activity. GPS data during measurement period of 2006-2015 show the existence of a fault with main stress in the northwest-southeast direction. The mechanism of the Cimandiri Fault is reverse fault with sinistral slip component and sinistral strike slip fault, while the swarm of VT earthquakes in Gede Volcano is dominated by reverse and normal faults. Tectonic earthquakes may trigger nearby volcanic eruption; it depends on the state of magma of the volcano and the magnitude of the earthquake.Keyword: Tectonic, Cimandiri fault, VT earthquake, Gede Volcano.
Emergence of Lava Dome from the Crater Lake of Kelud Volcano, East Java Hidayati, Sri; Basuki, Ahmad; Kristianto, Kristianto; Mulyana, Iyan
Indonesian Journal on Geoscience Vol 4, No 4 (2009)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1122.098 KB) | DOI: 10.17014/ijog.v4i4.83

Abstract

DOI: 10.17014/ijog.v4i4.83Kelud Volcano (+1731 m) in East Java is one of the most active and dangerous volcanoes in Indonesia. A large lake occupies the summit crater. Historical eruptions generally only lasted for a very short time, mostly no longer than a few hours. The outburst is usually accompanied by pyroclastic flows. On August 2007, the activity of the volcano was initiated by the increase of the temperature of lake water and the change of the colour from typical green to yellow. Activities of the volcano are discussed following the swarms of volcano-tectonic (VT) earthquakes on September 10th, September 26th to 29th, and October 24th to November 2nd. On September 26th to 29th, hypocentral distribution of those VT shifted from 5 km deep to just beneath the crater. The highest number of VT earthquakes occurred on November 1st attaining 50 events, then followed by a swarm of B-type events, where the number reached 1437 events in a day. The volcanic activity peaked on November 3rd when seismic records became saturated, which then was preceded by a sharp increase of lake temperature and a sudden deflation of radial tilt. It suggests that the lava extrusion forming a lava dome was taking place.
Magma Supply System at Batur Volcano Inferred from Volcano-Tectonic Earthquakes and Their Focal Mechanism Hidayati, Sri; Sulaeman, C.
Indonesian Journal on Geoscience Vol 8, No 2 (2013)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2639.733 KB) | DOI: 10.17014/ijog.v8i2.159

Abstract

DOI: 10.17014/ijog.v8i2.159The Volcano-Tectonic (VT) earthquakes occurring during September - November 2009 were analyzed. The result shows that the epicentres aligning in NE- SW direction coincided with the weak zone of Batur Volcano Complex. The focal zone is located at the depth around 1.5 - 5.5 km beneath the summit. Migration of magma was detected by ground deformation measured by GPS and focal mechanism. Mechanism of VT earthquake shows mostly normal fault types during the swarm in November 2009.
Proses Pembuatan Hidrolisat Protein Ikan Rucah Koesoemawardani, Dyah; Nurainy, Fibra; Hidayati, Sri
Jurnal Natur Indonesia Vol 13, No 3 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (207.008 KB) | DOI: 10.31258/jnat.13.3.256-261

Abstract

This study aimed to find optimum manufacturing trash fish protein hydrolyzate using the commercial papainenzyme. It is known that fish protein hydrolysates have good functional properties, so it is more widely utilized,especially for food. The study was conducted in two stages, the first stage was to make trash fish protein hydrolyzatetreated with enzyme concentration of 3%, 5%, 7% (w/w), and pH 5; 5.5; 6; 6.5; 7, whereas second stage was to maketrash fish protein hydrolyzate with same from the first stage and so the best treatment followed by treatment ofhalf-hour long incubation and one hour. Parameters observed were soluble protein, foamability, fat binding capacityand emulsion stability. The treatment was repeated three times and the first phase of data analysis using advancedtesting LSD and the second stage using the T test. Results show that the best soluble protein to produce a trashfish protein hydrolyzate enzyme was at a concentration of 5% and pH = 6.5 that was equal to 19.71%. In half an hourincubation produce higher soluble protein values and foamability that were equal to 24.97% and 9.63%, while thebinding capacity of fat in one hour incubation produces a higher value that was equal to 5.03%. Meanwhile, emulsionstability did not differ significantly at both incubation time.
Struktur Pasar Dan Peringkat Indonesia Pada Perdagangan Tuna Segar Dan Beku Di Pasar Dunia, Jepang, USA, Dan Korea Selatan Hidayati, Sri
Proceeding Seminar LPPM UMP Tahun 2014 2014: Proceeding Seminar Nasional LPPM 2014, 20 Desember 2014
Publisher : Proceeding Seminar LPPM UMP Tahun 2014

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Abstract

Tujuan dari penelitian ini adalah untuk mengetahui struktur pasar dan mengetahui status Indonesia sebagai eksportir segar dan beku tuna di pasar kata, yaitu Jepang, Amerika Serikat, dan Rep Korea. Melalui penelitian ini, peneliti akan menunjukkan competitveness perdagangan tuna segar dan beku di dunia baik tujuan ekspor Indonesia. Penelitian ini menggunakan time series data dari tahun 1988 hingga 2012. Metode analisis yang Herfindahl Index (HI) dan Konsentrasi Rasio (CR4). Software Microsoft Exel yang digunakan untuk analisis. Hasil penelitian ini menunjukkan bahwa:. (1) Indonesia adalah eksportir tetap baik eksportir utama pada perdagangan segar dan beku tuna di Jepang, Amerika Serikat, dan Korea sebagai pasar dunia, (2) struktur pasar tuna segar di Jepang dan Amerika Serikat ; . dan tuna beku dari Jepang dan Rep Of Korea dipimpin untuk oligopoli; sementara pasar beku tuna di USA dipimpin monopoli baik pasar tuna segar di Rep. Dari Korea.Kata kunci: segar dan beku tuna, struktur pasar.
Inventarisasi Sarana dan Prasarana Pemukiman di Lembah Cikapundung Hidayati, Sri; Mukhsin, Dadan
ETHOS (Jurnal Penelitian dan Pengabdian) Vol 1 No.2 (2003) Ethos: Jurnal Penelitian dan Pengabdian (Sains & Teknologi)
Publisher : Universitas Islam Bandung

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Abstract

cikapundung valley is a potential location which is surrounding by the famous university in Bandung.
PENGARUH RASIO MOL, SUHU DAN LAMA REAKSI TERHADAP BILANGAN IOD, BILANGAN ASAM, BILANGAN PEROKSIDA DAN KANDUNGAN SULFONAT SURFAKTAN DARI CPO Hidayati, Sri; -, Illim
Jurnal Riset Kimia Vol 2, No 2 (2009): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v2i2.155

Abstract

 ABSTRACT A surfactant is a surface-active agent that can be produced by chemical or biochemical synthesis.  The main characteristic of a surfactant is having polar and non polar groups at the same molecule (amphiphilic molecules) and forming head-tail configuration. This research as aimed to obtain      the optimum condition (reaction temperature, sulphonation reaction and molar ratio)                              of sulphonation process in producing MES from CPO methyl ester and to investigate                          the characteristic of MES produced. Measurements conducted include iodine value, acid value, peroxide value and absorbance of Sulfonate. Experimental design used was Response Surface Method (RSM) and Central Composite Design (CCD) with three factors. MES resulted from this best condition   had following characteristic or CPO was obtained with ratio of reactants of 1:1.5, reaction time of 4.5 hour and reaction temperature of 108.9ºC with Acid value of 13.32 mg KOH/g sample, Iod value  of 41.12 Iod g/100 sample, Peroxide value of 7.6 mmole/1000 g, sulfonat absorbance of 0.76 AU. Keywords :  metil ester sulfonat, acid value, iod value, peroxide value    
Tectonic Model of Bali Island Inferred from GPS Data Sulaeman, Cecep; Hidayati, Sri; Omang, Amalfi; Priambodo, Imam Catur
Indonesian Journal on Geoscience Vol 5, No 1 (2018)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1743.905 KB) | DOI: 10.17014/ijog.5.1.81-91

Abstract

DOI: 10.17014/ijog.5.1.81-91Seven periods of GPS campaign have been conducted for three years since March 2013 - October 2015 on fourteen GPS sites across Bali Island. The GAMIT/GLOBK 10.6 version was used to compute data with respect for thirteen reference sites of International Terrestrial Reference Frame (ITRF) 2008 surrounding Bali. The result shows that horizontal displacement varies between 1.93 and 22.53 mm/yr dominantly northeastward. Vertical displacement ranges at -184.34 to 33.79 mm/yr. The result of modeling using Coulomb 3.3 version indicates the deformation in Bali was mostly contributed by subduction at the southern part, West and East Flores Back-Arc Thrust at the north, Lombok Strait Fault and a fault at the eastern coast of Bali with the estimation maximum magnitude of 7.1, 6.6, 6.8, 5.8, and 5.2, respectively.
STRUKTUR PASAR DAN PERINGKAT INDONESIA PADA PERDAGANGAN TUNA SEGAR DAN BEKU DI PASAR DUNIA, JEPANG, USA, DAN KOREA SELATAN Hidayati, Sri
Jurnal Analisis Bisnis Ekonomi Vol 12 No 1 (2014): Volume 12, Nomor 1, April 2014
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (389.423 KB)

Abstract

Tujuan dari penelitian ini adalah untuk mengetahui struktur pasar dan mengetahui status Indonesia sebagai eksportir segar dan beku tuna di pasar kata, yaitu Jepang, Amerika Serikat, dan Rep Korea. Melalui penelitian ini, peneliti akan menunjukkan competitveness perdagangan tuna segar dan beku di dunia baik tujuan ekspor Indonesia. Penelitian ini menggunakan time series data dari tahun 1988 hingga 2012. Metode analisis yang Herfi ndahl Index (HI) dan Konsentrasi Rasio (CR4). Microsoft Exel Software yang digunakan untuk analisis. Hasil penelitian ini menunjukkan bahwa:. (1) Indonesia adalah eksportir tetap baik eksportir utama pada perdagangan segar dan beku tuna di Jepang, Amerika Serikat, dan Rep Of Korea sebagai pasar dunia, (2) struktur pasar tuna segar di Jepang dan Amerika Serikat ; . dan tuna beku dari Jepang dan Rep Of Korea dipimpin untuk oligopoli; sementara pasar beku tuna di USA dipimpin monopoli baik pasar tuna segar di Rep. Dari Korea