Publikationsdatum:
2017-04-04
Beschreibung:
Waveforms of seismic events occurred at epicentral distances ranging from 30
to 90 , and recorded by 3-component stations installed in peninsular Italy and in eastern
Sicily, were analyzed using the receiver function technique. Receiver functions are time
series where the arrivals of P-to-S waves converted at marked velocity contrasts beneath a
seismometer are enhanced. Teleseismic receiver functions are frequently used to identify
waves converted at the Moho discontinuity to infer crustal thickness. Across the northern
Apennines, receiver functions show that west of this chain (i.e. beneath the Elba island and
Tuscany) the Moho is flat and shallow, while it deepens from the eastern coast of the peninsula
toward the chain. Two Ps conversions are observed at a station located in the Tiberina
valley, indicating the presence of the Moho at depths of about 20 and 52 km. More to the
south, across the central Apennines, the Moho is shallower beneath the Tyrrhenian margin
of the peninsula than beneath the Adriatic margin, and deepens from both sides toward the
Apennines. The largest crustal thickness is inferred in the area of highest topography. The
Moho depths estimated with the receiver function technique are in agreement with the interpretation
of active seismic data in the western margin of peninsular Italy and along the
Adriatic coast, while they are significantly larger beneath the Apennines. Results of an ongoing
study in eastern Sicily show that Moho depth increases from north to south. In this
area, the northernmost stations show a also a later Ps converted by a lower interface.
Beschreibung:
Published
Beschreibung:
Erice (TP), Italy
Beschreibung:
3.3. Geodinamica e struttura dell'interno della Terra
Beschreibung:
open
Schlagwort(e):
Moho
;
teleseismic receiver functions
;
04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
Repository-Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Materialart:
Conference paper
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