Electronic Theses and Dissertation

ABSTRAK
Pergerakan antar lempeng tektonik membentuk zona subduksi dan sesar – sesar aktif di Wilayah Sumatera. Keberadaan sesar – sesar tersebut mengakibatkan sering terjadi gempa bumi di Sumatera. Salah satu wilayah yang sangat aktif terhadap gempa adalah Aceh Tengah. Dampak gempa di suatu daerah dapat dikaji dari percepatan tanah dan intensitas gempa bumi. Penelitian ini bertujuan untuk mengetahui nilai percepatan gerakan tanah maksimum akibat gempa bumi di Aceh Tengah dengan menggunakan metode rumusan empiris Donovan berdasarkan parameter gempa yaitu jarak sumber gempa terhadap lokasi tinjauan, magnitudo gempa dan kedalaman gempa bumi. Penelitian ini menggunakan data gempa yang diperoleh dari katalog ISC mulai tahun 1964 – 2017 dengan batasan sebaran wilayah gempa 2º LU - 6º LU dan 85º BT - 99º BT, magnitudo gempa ? 5.5 dan kedalaman gempa ? 150 km. Selain mendapatkan nilai percepatan tanah maksimum, intensitas gempa bumi di wilayah Aceh Tengah juga dapat diketahui berdasarkan nilai percepatan tanah yang telah diperhitungkan. Hasil penelitian menunjukkan bahwa nilai percepatan n tanah maksimum di Aceh Tengah berdasarkan metode empiris Donovan berkisar antara 40 gal – 117 gal dengan intensitas gempa berkisar antara V - VII. Kawasan yang memiliki nilai intensitas gempa V – VII berpotensi mengalami goncangan yang dapat merusak bangunan, terjadi retakan dan berpotensi terjadi gerakan tanah.

Kata Kunci: Gempa bumi, percepatan tanah maksimum (PGA), metode Donovan, intensitas gempa bumi.
ABSTRACT
Movement between tectonic plates forms subduction zones and active faults in the Sumatran. The presence of these faults caused frequent earthquakes in the Sumatran region. One area that is active against earthquakes is Central Aceh. The earthquake impact of an area can be investigated from the peak ground accelaration and intensity of the earthquake. This study aims to determine the value of the maximum acceleration of ground motion due to the earthquake in Central Aceh by using the Donovan empirical formula based on earthquake parameters namely the distance of the earthquake source to the location of the observation, earthquake magnitude and earthquake depth. This study uses earthquake data obtained from the ISC catalog from 1964 – 2017 with an area limit of 2º N - 6º N dan 85º E - 99º E, earthquake magnitude ? 5.5 and depth of earthquake ? 150 km. In addition to getting the maximum ground motion acceleration value, the intensity of the earthquake in the Central Aceh region can also be known based on the value of the ground motion acceleration that has been calculated. The results showed that the value of the maximum acceleration of ground motion in Central Aceh based on the Donovan empirical method ranged from 40 gal – 117 gal with earthquake intensities ranging from V – VII. Area that have an earthquake intensity value V – VII have the potential to experience shocks that can damage buildings, cracks occur and potentially occur ground movement.

Keywords: Earthquake, peak ground acceleration (PGA), Donovan method, earthquake intensity.

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