Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/7089
DC Field | Value | Language |
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dc.contributor.authorall | Helffrich, George; Bristol University | en |
dc.contributor.authorall | Pesaresi, Damiano; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia | en |
dc.contributor.authorall | Tonegawa, Takashi; Tokyo University | en |
dc.date.accessioned | 2011-09-13T10:23:49Z | en |
dc.date.available | 2011-09-13T10:23:49Z | en |
dc.date.issued | 2011-07-10 | en |
dc.identifier.uri | http://hdl.handle.net/2122/7089 | en |
dc.description.abstract | The Centro di Ricerche Sismologiche (CRS, Seismological Research Center) of the Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS, Italian National Institute for Oceanography and Experimental Geophysics) in Udine (Italy) after the strong earthquake of magnitude Mw=6.4 occurred in 1976 in the Italian Friuli-Venezia Giulia region, started to operate the North-eastern Italy (NI) Seismic Network: it currently consists of 13 very sensitive broad band and 21 simpler short period seismic stations, all telemetered to and acquired in real time at the OGS-CRS data center in Udine. Real time data exchange agreements in place with neighbouring Italian, Slovenian, Austrian and Swiss seismological institutes lead to a total number of 94 seismic stations acquired in real time, which makes the OGS the reference institute for seismic monitoring of North-eastern Italy. In this study we use P, pP, S and sS phases from global events recorded by the OGS local virtual seismic network in South-Central Europe to study upper mantle discontinuities above earthquakes in the subducted Pacific Plate. We use the time lag between the surface-reflected depth phase and a precursor to determine the discontinuity depth. Accurate estimation of reflector depth depends on a velocity model of the source-side mantle structure. In contrast to typical one-dimensional velocity models, our source-side structure is oceanic, with a shallow Moho and thin crust overlain with water. The time lag between the direct P and pP or S and sS arrivals without accounting for source structure can be as large as 5 s when compared to a purely continental model like iasp91 or ak135. We identify upper mantle discontinuities using slant stacking and depth-migrated standardized waveforms. The processing shows S-to-P arrivals from the 660 km discontinuity, the 410 km discontinuity, and shallower upper mantle ones of uncertain origin. | en |
dc.language.iso | English | en |
dc.publisher.name | CTBTO | en |
dc.relation.ispartof | CTBT: Science and Technology 2011 (S&T2011) | en |
dc.subject | upper mantle | en |
dc.subject | discontinuities | en |
dc.subject | OGS | en |
dc.subject | virtual seismic network | en |
dc.subject | South-Central Europe | en |
dc.subject | array | en |
dc.title | The OGS local virtual seismic network in South-Central Europe as an array: exploiting depth phases to locate upper mantle discontinuities | en |
dc.type | Poster session | en |
dc.description.status | Published | en |
dc.identifier.URL | http://www.ctbto.org/fileadmin/user_upload/SandT_2011/posters/T1-P27%20G_Helffrich%20The%20OGS%20local%20virtual%20seismic%20network%20in%20South-Central%20Europe%20as%20an%20array.pdf | en |
dc.subject.INGV | 04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics | en |
dc.description.ConferenceLocation | Vienna (Austria) | en |
dc.relation.references | Rawlinson & Kennett (2004) GJI, 157, 332-340. Schimmel & Paulssen (1997) GJI, 130, 497–505. Tonegawa & Helffrich (2011) submitted. | en |
dc.description.obiettivoSpecifico | 3.3. Geodinamica e struttura dell'interno della Terra | en |
dc.description.fulltext | open | en |
dc.contributor.author | Helffrich, George | en |
dc.contributor.author | Pesaresi, Damiano | en |
dc.contributor.author | Tonegawa, Takashi | en |
dc.contributor.department | Bristol University | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia | en |
dc.contributor.department | Tokyo University | en |
item.openairetype | Poster session | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Bristol University | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma1, Roma, Italia | - |
crisitem.author.dept | Tokyo University | - |
crisitem.author.orcid | 0000-0002-4411-7281 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Conference materials |
Files in This Item:
File | Description | Size | Format | |
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T1-P27_Helffrich.pdf | 3.33 MB | Adobe PDF | View/Open |
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