Pada uraian berikut akan dibahas sifat gelombang tremor vul-kanik secara semi-kwantitatif untuk mengetahui hubungan antara sebab, proses dan pengamatannya. Cara semi-kwantitatif dipilih supaya permasalahan tidak menjadi kompleks dan terlalu matematis.
The significant change in seismic activity for an active volcano is closely related to the stage of volcanic activity. Even in the dormancy period, the observation of seicmic activity of a particular volcano is very important to evaluate the status and to anticipate the future behavior. The Volcanological Survey of Indonesia installed triparti- te instruments at the Anak Krakatau and Sertung…