Kilat gempa bumi (EQL) akibat tanah longsor

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Referensi :

Enomoto Y, Yamabe T, Mizuhara K, Sugiura S, Kondo H. 2020. Laboratory investigation of earthquake lightning due to landslide. Earth, Planets and Space, 72:108.  DOI : https://doi.org/10.1186/s40623-020-01237-8.

Abstrak. Sejumlah studi eksperimen laboratorium mengenai karakteristik-karakteristik fotoemisi batuan dilakukan untuk menjelaskan mekanisme kilat gempa bumi (EQL). Pada sebagian besar studi, granit, yang menghasilkan fotoemisi yang sangat besar, digunakan untuk menjelaskan mekanisme yang berhubungan dengan pengaruh fotoemisi eksoelektron atau pengaruh kuarsa dari piezolistrik, yang merupakan mineral konstituen dari granit. Fotoemisi yang diakibatkan oleh retakan batuan telah diamati selama terjadinya tanah longsor akibat gempa bumi. Menurut literatur  gempa bumi dari waktu ke waktu, EQL yang dsebabkan oleh tanah longsor ditemukan bahkan pada lokasi-lokasi yang tidak mengandung kuarsa. Penelitian kali ini mengamati tentang karakteristik-karakteristik fisikokimia fotoemisi yang berhubungan dengan pengaruh retakan geser pada berbagai jenis batuan, yang dipilih berdasarkan catatan historis EQL tanah longsor akibat gempa bumi. Hasil penelitian menunjukkan bermacam proses fisikokimia yang berhubungan dengan pemanasan friksional yang dihasilkan selama dampak geser (shear impacts) antar batuan.

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