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Probing the sources of ambient seismic noise near the coasts of southern Italy
Author(s) -
Gu Yu Jeffrey,
Dublanko Curtis,
LernerLam Arthur,
Brzak Keith,
Steckler Michael
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl031967
Subject(s) - geology , ambient noise level , seismology , seismic noise , subduction , microseism , noise (video) , oceanography , tectonics , sound (geography) , artificial intelligence , computer science , image (mathematics)
In this study we probe the source of ambient noise in the southern Apennines and the Calabrian Arc by cross‐correlating two months of ambient seismic noise records collected during the Calabria‐Apennine‐Tyrrhenian/Subduction‐Collision‐Acretion Network (CAT/SCAN) project. Significant Rayleigh wave energy is observed on the vertical component of the noise correlation stacks and reveals multiple sources of ambient noise in southern Italy. The most dominant noise sources are found along (1) the Tyrrhenian coast of northern Calabria‐southern Campania and (2) the Adriatic Sea near the Gargano Promontory. Enhanced ocean currents evident from buoy records during the study period could be responsible for the observed microseisms. We validate the source locations using earthquake records and the consistency between noise and earthquake correlation functions supports the observed dominant directions of ambient seismic noise.