Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/601
Authors: | Nisii, V.* Zollo, A.* Iannaccone, G.* |
Title: | Depth of a Midcrustal Discontinuity beneath Mt. Vesuvius from the Stacking of Reflected and Converted Waves on Local Earthquake Records | Journal: | Bulletin of the seismological society of America | Series/Report no.: | 94, 5 | Publisher: | The Seismological Society of America | Issue Date: | 2004 | URL: | http://bssa.geoscienceworld.org | Keywords: | Mt. Vesuvius Midcrustal discontinuity |
Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis 05. General::05.01. Computational geophysics::05.01.01. Data processing |
Abstract: | We have developed a technique based on the move-out and stack of reflected seismic phases from local earthquake seismograms. For a given interface depth and a velocity model, the theoretical travel times of reflected/converted phases in a 1D medium are computed and used to align in time the vertical-component microearthquake records collected by a local seismic network. The locations and origin times of events are preliminarily estimated from P and S arrival times. Different seismic gathers are obtained for each considered reflected/converted phase at that interface, and the best interface depth is chosen as the one that maximizes the value of a semblance function computed on moved-out records. This method has been applied to seismic records of microearthquakes that occur at Mt. Vesuvius volcano. The analysis confirms the evidence for an 8 to 10-km-deep seismic discontinuity beneath the volcano, which was previously identified, by migration of active seismic data, as the roof of an extended magmatic sill. |
Appears in Collections: | Article published / in press |
Files in This Item:
Page view(s)
150
checked on Apr 24, 2024
Download(s)
76
checked on Apr 24, 2024