Examining ambient noise using colocated measurements of rotational and translational motion

被引:73
作者
Hadziioannou, Celine [1 ]
Gaebler, Peter [2 ]
Schreiber, Ulrich [3 ]
Wassermann, Joachim [1 ]
Igel, Heiner [1 ]
机构
[1] Univ Munich, Dept Earth & Environm Sci, D-80333 Munich, Germany
[2] Deutsch GeoForschungsZentrum GFZ, Helmholtz Zentrum Potsdam, Sekt Seismol 24, D-14473 Potsdam, Germany
[3] Forschungseinrichtung Satellitengeodasie, Fundamental Stn Wettzell, D-93444 Bad Kotzting, Germany
关键词
Rotational ground motion; Ring laser; Ambient noise; RING; OBSPY;
D O I
10.1007/s10950-012-9288-5
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
In the past decade, a number of studies have reported the observation of rotational motion associated with seismic events. We report a first observation of rotational motion in the microseismic ambient noise band. A striking feature of rotational motion measurements is that the information about the seismic phase velocity and source back azimuth is contained in the amplitude ratio of a point measurement of rotation rate and transverse acceleration. We investigate the possibility of applying this method to ambient noise measured with a ring laser and a broadband seismometer at the Wettzell Geodetic Observatory in Germany. Using data in the secondary microseismic band, we recover local phase velocities as well as the back azimuth of the strongest noise source for two different time periods. In order to confirm these findings, we additionally compare the results with classical array processing techniques of the Grafenberg array located nearby.
引用
收藏
页码:787 / 796
页数:10
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