FN Archimer Export Format
PT J
TI Detection of microseismic compressional (P) body waves aided by numerical modeling of oceanic noise sources
BT 
AF OBREBSKI, Mathias
   ARDHUIN, Fabrice
   STUTZMANN, Eleonore
   SCHIMMEL, Martin
AS 1:1,2;2:1;3:3;4:4;
FF 1:PDG-ODE-LOS;2:PDG-ODE-LOS;3:;4:;
C1 IFREMER, Lab Oceanog Spatiale, Plouzane, France.
   LUNAM Univ, Ecole Cent Nantes, LHEEA, Nantes, France.
   PRES Univ Paris Cite, IPGP, Paris, France.
   CSIC, Inst Earth Sci Jaume Almera, Barcelona, Spain.
C2 IFREMER, FRANCE
   ECOLE CENT NANTES, FRANCE
   IPGP, FRANCE
   CSIC, SPAIN
SI BREST
SE PDG-ODE-LOS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
TC 38
UR https://archimer.ifremer.fr/doc/00161/27251/25448.pdf
LA English
DT Article
DE ;compressionnal body waves;noise source;double frequency microseism;numerical modeling
AB Among the different types of waves embedded in seismic noise, body waves present appealing properties but are still challenging to extract. Here we first validate recent improvements in numerical modeling of microseismic compressional (P) body waves and then show how this tool allows fast detection and location of their sources. We compute sources at similar to 0.2 Hz within typical P teleseismic distances (30-90 degrees) from the Southern California Seismic Network and analyze the most significant discrete sources. The locations and relative strengths of the computed sources are validated by the good agreement with beam-forming analysis. These 54 noise sources exhibit a highly heterogeneous distribution, and cluster along the usual storm tracks in the Pacific and Atlantic oceans. They are mostly induced in the open ocean, at or near water depths of 2800 and 5600km, most likely within storms or where ocean waves propagating as swell meet another swell or wind sea. We then emphasize two particularly strong storms to describe how they generate noise sources in their wake. We also use these two specific noise bursts to illustrate the differences between microseismic body and surface waves in terms of source distribution and resulting recordable ground motion. The different patterns between body and surface waves result from distinctive amplification of ocean wave-induced pressure perturbation and different seismic attenuation. Our study demonstrates the potential of numerical modeling to provide fast and accurate constraints on where and when to expect microseismic body waves, with implications for seismic imaging and climate studies.
PY 2013
PD AUG
SO Journal Of Geophysical Research-solid Earth
SN 0148-0027
PU Amer Geophysical Union
VL 118
IS 8
UT 000324991900027
BP 4312
EP 4324
DI 10.1002/jgrb.50233
ID 27251
ER

EF