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All Journal Jurnal Fisika Unand Jurnal Geosaintek JOURNAL ONLINE OF PHYSICS Journal of Applied Geospatial Information Journal of Appropriate Technology for Community Services Jurnal Riset Fisika Indonesia

Tri Kusmita

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Author-ID : 3080481

Astronomy Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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ANALISIS DATA EQUATORIAL ATMOSPHERE RADAR(EAR) PADA GEMPA PADANG PARIAMAN 30 SEPTEMBER 2009 Tri Kusmita; Dwi Puji Astuti; Eddy Hermawan
Jurnal Fisika Unand Vol 1, No 1: Oktober 2012
Publisher : Universitas Andalas

Telah dilakukan analisis data EAR pada gempa PadangPariaman untuk melihat ada atau tidaknya anomali kecepatan angin pada kasus gempa bumi Padang Pariaman 30 September 2009.Dalam penelitian ini digunakan software xygraph untuk pengolahandata kecepatan angin yang terekam oleh EAR dalam orde 2,3 menit menjadi sebuah grafik vektor angin. Analisis yang dilakukan merupakan analisis kualitatif yang berdasarkan pada hasil plot grafik vektor angin. Hasil analisis menunjukkan bahwa untuk kasus gempa bumi Padang-Pariaman tidak ditemukan adanya anomali kecepatan angin. Namun,gangguan konstan yang terekam oleh EAR pada rentang waktu pengamatan dari puluk 16:00 WIB (30 September 2009)-03:00 WIB 1 Oktober 2009) kemungkinan disebabkan oleh adanya gangguan cuaca yang terjadi pada lapisan tropopause.

STUDI AWAL SEISMOTEKTONIK DI WILAYAH JAWA BARAT BERDASARKAN RELOKASI HIPOSENTER METODE DOUBLE DIFFERENCE Tri Kusmita; Ilham Pribadi; Nasri MZ; Supriyanto Rohadi
Jurnal Geosaintek Vol 6, No 1 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v6i1.6697

Jawa barat mempunyai aktivitas kegempaan yang sangat tinggi. Aktivitas kegempaan di wilayah Jawa Barat dikontrol oleh struktur geologi regional dan keberadaan sesar-sesar lokal. Aktivitas sesar-sesar lokal dan zona keberadaan zona subduksi dapat dipelajari dari sebaran hiposenter pada daerah tersebut. Sebaran hiposenter yang diperoleh dari katalog BMKG biasanya berasal dari quick count dengan mengabaikan beberapa parameter. Oleh karena itu, lokasi hiposenter tersebut harus direlokasi untuk menentukan hubungan hiposenter gempa dengan aktivitas tektonik daerah tersebut. Metode relokasi hiposenter yang digunakan adalah metode Double Difference. Metode ini digunakan untuk mengidentifikasi zona patahan berdasarkan distribusi gempa yang terjadi. Prinsip metode Double Difference adalah jarak persebaran hiposenter antara dua gempabumi sangat kecil dibandingkan dengan jarak antara stasiun gempabumi, maka raypath dan waveform kedua gempabumi dapat dianggap mendekati sama. Data yang digunakan dalam penelitian ini adalah data gempabumi yang terjadi pada periode Juli 2017-Juni 2018 di Jawa Barat. Hasil relokasi hiposenter menunjukkan bahwa kegempaan di Jawa Barat Sebagian besar berasosiasi dengan zona subduksi. Penunjaman yang terjadi relatif landai. Kedalaman aktivitas gempabumi pada zona subduksi tersebut sekitar 0-70 km. Aktifitas kegempaan pada Sesar-sesar lokal relatif sangat dangkal dan tersebar hampir di setiap segmen sesar lokal.

ANALISIS PARAMETER SUMBER SPEKTRAL GEMPABUMI VTA (VULKANO TEKTONIK-A) TERHADAP AKTIVITAS VULKANIK GUNUNG SINABUNG Tri Kusmita; Kirbani Brotopuspito; Hetty Triastuty
JOURNAL ONLINE OF PHYSICS Vol. 5 No. 1 (2019): JOP (Journal Online of Physics) Vol 5 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i1.8267

The source parameters describe the different physical properties of seismic volumes under the volcanoes. Source parameters that can be used to distinguish seismic events that are generated by different types of volcanoes activities. Temporary changes of the spectral source parameters provided a description of the main events during the eruption process. Source parameters are calculated by correlating the relationship between source frequency at spectral displacement (corner frequency) and source parameters based on spectral sources of the Brune model (1970). The angular frequency obtained by applying the FFT algorithm to the VTA spectral displacement. The source parameters analyzed from this VTA earthquake are the spectral slope, seismic moment, stress drop, length of rupture, moment magnitude and radiation energy. Based on the obtained corner frequency (12 Hz-13 Hz), seismic moment, moment magnitude and energy radiation respectively were at 0.2 -1.9 x 1012 Nm, 0.7 - 2 Mw, and 0.1 - 9.5 x 1015 erg. The length of rupture were from 144.2 to 243.1 m, the spectra slope has 2.1 - 7.8 dB/cm, and stress drop are 0.1 - 7,6 bar. From the results of this study, it can be concluded that the changes of spectra characteristic and fluctuate of source patrameters value of VTA earthquakes was asosiated with the different volcanic activity of Sinabung. Keywords: spectral, VTA, source parameter, volcanic earthquake

SEBARAN MINERAL IKUTAN TIMAH DI WILAYAH BEKAS PENAMBANGAN MENGGUNAKAN METODE SELF POTENTIAL (SP) SEBAGAI INDIKASI AWAL KETERDAPATAN LOGAM TANAH JARANG (LTJ) Tri Kusmita Kusmita; Anisa Indriawati; Yekti Widyaningrum
JOURNAL ONLINE OF PHYSICS Vol. 7 No. 2 (2022): JOP (Journal Online of Physics) Vol 7 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v7i2.18282

Indonesia mempunyai potensi besar untuk menjadi produsen logam tanah jarang (LTJ) yang semakin dibutuhkan untuk industri dalam negeri ataupun global. Data pusat sumber daya geologi menyebutkan bahwa cadangan mineral LTJ saat ini di Indonesia diperkirakan sekitar 200.000 ton. Endapan LTJ yang berasosiasi dengan batuan granitik dijumpai pada jalur timah Indonesia, salah satunya Bangka Belitung. Mineral tanah jarang (monasit, xenotime dan zircon) diasosiasikan dengan deposit alluvial timah, uranium dan emas. Di kepulauan Bangka Belitung mineral tanah jarang ditemukan sebagai mineral ikutan dari proses penambangan dan ekstraksi mineral timah. Penelitian ini dilakukan untuk melihat sebaran mineral ikutan timah jarang menggunakan metode self potential dan menganalisis indikasi keterdapatan mineral logam tanah jarang menggunakan metode XRF. Metode Self potential dilakukan dengan menerapkan desain akuisisi fixed based. Pengambilan sampel uji XRF dilakukan secara acak yang tersebar di beberapa titik di sepanjang area penelitian. Hasil penelitian menunjukkan bahwa Sebaran mineral di daerah Danau Ampar tidak tersebarsecara merata. Mineral Quartz Vein dan Pegmatite (+10 hingga + 70 mV) sebagai mineral pembawa bijih timah mendominasi bagian Timur ke arah Baratlaut dan Barat hingga Baratlaut. Berdasarkan metode XRF terdapat indikasi keterdapatan elemen unsur tanah jarang Y, Eu dan Nd dengan kemungkinan mineral LTJ berupa Monazite dan Xenotime.

Pelatihan Pemanfaatan Limbah Plastik Menjadi Berbagai Kreasi Daur Ulang Bagi Masyarakat Desa Penyak Yuant Tiandho; Herman Aldila; Yekti Widyaningrum; Tri Kusmita; Anisa Indriawati; Widodo Budi Kurniawan; Fitri Afriani
Journal of Appropriate Technology for Community Services Vol. 2 No. 2 (2021)
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jattec.vol2.iss2.art2

As an archipelago, handling plastic waste in the Province of Bangka Belitung Islands is an aspect that needs to be taken seriously. Apart from being focused on developing tourist areas, plastic waste will easily be carried to the sea and prone to be degraded into microplastics, often consumed by marine animals. This community service activity focuses on Penyak Village, Kec. Koba, Kab. Central Bangka, Bangka Belitung Islands. To solve the plastic problem in that location, the community service team conducted training for the community, especially for Pendidikan Kesejahteraan Keluarga (PKK) members, related to processing plastic waste into various recycled creations such as bags, pencil cases, and different kinds of souvenirs. The training program is carried out by providing materials and direct training to increase the understanding and skills. To broaden people's insights, the team conducted training with the Ecoplantstic start-up, which focuses on developing waste-based products. Through the evaluation, it is known that the training provided can improve the knowledge and skills of the community in processing plastic waste into various recycled creations, and several participants plan to develop the skills acquired for entrepreneurial purposes.

Kerentanan Seismik di Wilayah Telanaipura dan Kotabaru Kota Jambi Rizki Hidayat; Tri Kusmita
Jurnal Riset Fisika Indonesia Vol 1 No 1 (2020): Desember 2020
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Geologically the city of Jambi lies in the formation of Air Benakat, Muara Enim, Kasai, and alluvium deposits. The rock units that make up this formation were all composed by fine sediment. Based on these geological conditions, the Jambi City region has a high level of seismic priority. This research was conducted to study seismic vulnerability in this region, using the microtremor method. Microtremor is a ground vibration that can be produced by natural resources. This natural resource consists of wind and sea waves that have a long period of time or like traffic, factory machinery, and so on. Based on the results of the study obtained from the Kotabaru and Telanaipura regions have natural frequencies in the range 1.24 Hz - 4.35 Hz. The amplification factor was 1.13 - 3.34 and it was included in the low category. seismic vulnerability index in both regions was 0.50 - 8.58 x 10-6 cm / s2. seismic vulnerability index values were relatively high in Kelurahan Penyengat Rendah (Telanaipura). It was not recommended for skyscraper construction.

Identifikasi Struktur Tektonik Sistem Geothermal Non-Vulkanik Daerah Nyelanding dan Permis Bangka Selatan Menggunakan Metode Gravity Githa Nurvilia Afni; Tri Kusmita
Jurnal Riset Fisika Indonesia Vol 2 No 1 (2021): Desember 2021
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Non-volcanic geothermal is a heat system that is not related to volcanism such as in Nyelanding and Permis areas. In previous studies, hot springs in the Nyelanding area were spread from West to Northeast, with the constituent rocks of sandstone, dry gravel and granite. In the Permis area, the manifestation is influenced by shear faults trending Northwest to Southeast and the geothermal source is granite. Therefore, this study was conducted to determine the strenght of local tectonic structures using the gravity method. The data used in this study are the FAA (Free Air Anomaly) and topography data obtained through the TOPEX website. The gravity anomaly is obtained by performing spectral analysis using the Fourier Transform and moving average filter. 2D modeling is performed using inverse modeling with the smoothness constraint equation. The result of this research is that the Permis and Nyelanding geothermal systems are controlled by local tectonic structures in the Northwest and Southeast of the study area, in the form of fractures (possibly faults) with a Northeast – Southwest direction

Analisis Anomali Gravity Daerah Panas Bumi Non-Vulkanik Di Bangka Tengah (Studi Kasus Panas Bumi Terak dan Keretak) Eri Gusnia; Tri Kusmita; Anisa Indriawati
Jurnal Riset Fisika Indonesia Vol 2 No 2 (2022): Juni 2022
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Central Bangka is one area that has geothermal potential such as the Terak and Keretak area. These area have hot spring manifestation. Geothermal manifestations in Bangka is the type of non-volcanic radiogenic geothermal. Origin sources of this manifestation suspected from rocks run into the crack, folds and faults. The purpose of this study was to identify rock speading in geothermal area and it’s correlation between geothermal manifestation in Terak and Keretak. he data obtained from the TOPEX/Poseidon satellite is in the form of FAA (Free Air Anomaly) data. The data is then corrected using Burger correction and field correction. Spectral analysis was performed by Fourier transform with moving average filter. The results showed that Complete Bouger Anomaly has 13 mGal-39 mGal. Regional anomaly has 5,4 mGal - 9.8 mGal. Residual anomaly has 7 mGal sampai 29 mGal. There area was consist of intrusive granite rock from the Granite Klabat formation, clas and sandstone from Tanjung Genting Formation. Gravity anomaly shown Geothermal Terak and Keretak are composed of the same distribution of rock.

Identification of Subsurface Rock Structure of Non-Volcanic Geothermal Systems Based on Gravity Anomalies (Terak Village, Central Bangka Regency) Reza Firdaus; Siska Oktaviyani; Putri Hardianti; Tri Kusmita; Anisa Indriawati
Journal of Applied Geospatial Information Vol 5 No 2 (2021): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v5i2.3640

Abstract Geothermal manifestations on Bangka Island are found in the villages of Terak, Pemali, Sungailiat/Pelawan, Dendang, Permis, and Nyelanding. The manifestation of hot water in Terak Village, Central Bangka Regency is in the form of 3 hot springs with a surface temperature of 55ᵒC this research is to be carried focus on the structure of the subsurface rock layers using the geophysical method, namely the gravity method. The data used are topography and Free Air Anomaly. The data processing is in the form of Bouguer Correction and Terrain Correction to obtain the Complete Bouguer Anomaly (CBA) value. Then the CBA value is separated from regional anomalies and residual anomalies using the upward continuation method, as well as 2D modeling interpretation (forward modeling). From the research results, it is known that the subsurface rock structure of the non-volcanic geothermal system in Terak Village in the form of sandstone (2.28 – 2.49 gr/cm3) at a depth of 0 – 1.44 km is estimated as caprock, granite (2.77 – 2.78 gr/cm3) at a depth of 0 – 1.8 km is estimated as reservoir rock, and diorite rock (2.87 – 2.99 gr/ cm3) at a depth of 0 – 2 km is estimated as basement rock.

Sebaran Batuan Daerah Panas bumi Terak Bangka Tengah berdasarkan Anomali Magnetik Umi Alawiyah; Tri Kusmita
Jurnal Riset Fisika Indonesia Vol 3 No 1 (2022): Desember 2022
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v3i1.3356

Geothermal potential in Indonesia has various non volcanic geothermal sources, one of which is geothermal in the Terak Village area of Central Bangka. The geothermal geological structure of Terak is in the form of granite rocks with normal faults and horizontal faults or what is called the Pemali fault. The purpose of this research is to identify rock spreading on geothermal Terak based on magnetic anomaly. Magnetic data was processing by applied diurnal correction, IGRF correction, RTE (Reduce to the Equator) correction. Reginal dan residual anomaly was separation using upward continuation 350 m, 400 m, and 450 m. The result shown that rock spreading on geothermal Terak was consist by granite rock from Granite Klabat formation in north Mangkol Hill, sandstone from Tanjung Genting formation on West study area. Schist and phyllite was dominated on northeast and northwest area.

Co-Authors Anisa Indriawati Dwi Puji Astuti Eddy Hermawan Eri Gusnia Eri Gusnia Eri Gusnia Fitri Afriani Githa Nurvilia Afni Herman Aldila Hetty Triastuty Ilham Pribadi Kirbani Brotopuspito Liyana Aryanto Mardani Mardani Mursid Mursid Nasri MZ Putri Hardianti Rara Mutia Reza Firdaus Rizki Hidayat Rusdianto Rusdianto Siska Oktaviyani Suci Fathia Supriyanto Rohadi Susanti Susanti Talitha Talitha Umi Alawiyah Widodo Budi Kurniawan Yekti Widyaningrum Yekti Widyaningrum Yuant Tiandho

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