Nurhafizah, Chichi (2026) Identifikasi Misorientation Sensor Seismograf BMKG di Pulau Sumatera Menggunakan Metode P-wave Particle Motion dengan Sumber Gempa Bumi Teleseismik. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Tuntutan akan ketersediaan data seismik yang andal untuk analisis mekanisme sumber gempa bumi muncul dari karakter Pulau Sumatera sebagai kawasan dengan tingkat aktivitas tektonik yang sangat tinggi, yang dipengaruhi secara langsung oleh keberadaan zona subduksi dan sistem sesar aktif di wilayah tersebut. Penelitian ini mengevaluasi orientasi 114 sensor seismograf milik BMKG yang tersebar di Pulau Sumatera menggunakan metode P-wave particle motion. Hasil analisis menunjukkan bahwa seluruh sensor tidak terpasang tepat pada arah utara sejati dan memperlihatkan variasi misorientation yang bersifat sistematis dengan rentang deviasi antara 1° hingga 46°. Sebanyak 27 sensor (23,7%) mengalami misorientation signifikan (>16°) yang konsisten pada berbagai kejadian gempa teleseismik, mengindikasikan kesalahan instalasi permanen sebagai penyebab utama. Analisis lanjutan mengaitkan distribusi misorientation dengan kondisi geologi dan tingkat antropogenik sebagai konteks interpretatif. Temuan ini menegaskan pentingnya evaluasi orientasi sensor secara berkala untuk menjaga kualitas dan reliabilitas data seismik di wilayah rawan gempa seperti Sumatera. Penelitian ini merupakan evaluasi sistematis berskala besar pertama terhadap orientasi sensor BMKG di Sumatera dengan memanfaatkan analisis gerak partikel gelombang teleseismik, sehingga memberikan dasar ilmiah penting bagi pengembangan standar kualitas jaringan seismograf nasional.
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The need for dependable seismik data to support accurate earthquake source mechanism analysis arises from the pronounced tectonic activity of Sumatra Island, which is governed by subduction zones and active fault systems. Using the P-wave particle motion method, this study examines the orientation of 114 BMKG seismograph sensors installed throughout Sumatra Island. The analysis reveals that none of the sensors are perfectly aligned with true north, instead displaying systematic misorientation with deviation angles spanning 1° to 46°. Among them, 27 sensors (23.7%) exhibit substantial misorientation (>16°) that persists consistently across multiple teleseismik events, pointing to permanent installation errors as the dominant factor. The spatial pattern of these misorientations is further interpreted in relation to local geological settings and surrounding anthropogenic environments. Collectively, these results underscore the necessity of regular sensor orientation assessments to preserve the accuracy and reliability of seismik data in tectonically active regions such as Sumatra. Moreover, this work constitutes the first large-scale sistematic evaluation of BMKG seismograph sensor orientation in Sumatra based on teleseismik P-wave particle motion analysis, thereby establishing an essential scientific foundation for the development of national seismograph network quality standards.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Misorientation Sensor Seismograf, P-wave Particle Motion, Gempa Bumi Teleseismik, Sumatera Misorientation Sensor Seismograf, P-wave Particle Motion, Teleseismic events, Sumatra |
| Subjects: | Q Science > QC Physics > QC100.5 Measuring instruments (General) Q Science > QE Geology > QE538.8 Earthquakes. Seismology |
| Divisions: | Faculty of Industrial Technology > Physics Engineering > 30101-(S2) Master Thesis |
| Depositing User: | Chichi Nurhafizah |
| Date Deposited: | 05 Feb 2026 00:52 |
| Last Modified: | 05 Feb 2026 00:52 |
| URI: | http://repository.its.ac.id/id/eprint/132157 |
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