Seismological constraints for the dyke emplacement of the July-August 2001 lateral eruption at Mt. Etna volcano, Italy

摘要: In this paper we report seismological evidence regarding the emplacement of dike that fed July 18 - August 9, 2001 lateral eruption at Mt. Etna volcano. The shallow intrusion and opening eruptive fracture system, which mostly occurred during 12, 18, were accompanied by one most intense seismic swarms last 20 years. A total 2694 earthquakes (1 £ Md 3.9) recorded from beginning swarm (July 12) to end (August 9). Seismicity shows upward migration basement relatively thin volcanic pile. clear hypocentral was observed, well constraining upwards propagation a near-vertical dike, oriented roughly N-S, located few kilometers south summit region. Earthquake distribution orientation P-axes focal mechanisms indicate caused local stress source related intrusion.