Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j.135p&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 10, pp. 135-1, CiteID 1497, DOI 10.1029/2001GL014391
Physics
18
Tectonophysics: Tomography, Volcanology: Magma Migration, Volcanology: Eruption Mechanisms
Scientific paper
On July, 12, 2001, Mt. Etna experienced a sudden increase of seismic activity heralding one of the most intense eruptions of the past 30 years. Between July 12 and July 18, when the eruption started, thousands of small magnitude earthquakes occurred and were recorded by a dense seismic network run by the Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania (INGV-CT). Hypocentral depths of earthquakes were very shallow, mostly located above 3 km b.s.l. and clustered near the summit area. The high quality seismic dataset gives us the unique opportunity to study the process of magma migration before the eruption. In this study we present the three-dimensional earthquake locations and the velocity structure obtained by a tomographic inversion. The shallowness of seismicity allowed us to enhance the details of the structure beneath the summit craters, in a volume poorly defined by previous tomographic studies. The presence of a high Vp-body previously observed at Mt. Etna is confirmed at shallow depth beneath the southeastern part of the summit area. The earthquakes preceding the eruption onset concentrated at its western border. A low Vp/Vs anomaly is found at 0-1 km depth, just at the top of the volume where the magma intruded before the eruption. This anomalous zone can be considered as molten material wealthy in gas. The relocated seismicity occurs in a cylinder below the vents activated along the fracture system and exhibited an upward migration until the eruption. All these results show evidence for the emplacement of a near-vertical dyke striking about N-S and a few kilometres south of the summit craters.
Boschi Enzo
Chiarabba Claudio
Cocina Ornella
de Gori Pasquale
Moretti Milena
No associations
LandOfFree
Tomographic images and 3D earthquake locations of the seismic swarm preceding the 2001 Mt. Etna eruption: Evidence for a dyke intrusion does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Tomographic images and 3D earthquake locations of the seismic swarm preceding the 2001 Mt. Etna eruption: Evidence for a dyke intrusion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tomographic images and 3D earthquake locations of the seismic swarm preceding the 2001 Mt. Etna eruption: Evidence for a dyke intrusion will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1517917