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Supporting Online Material to: Deep harmonic tremor on the

Summary: Supporting Online Material to:
Deep harmonic tremor on the
San Jacinto fault, southern California
G. Hillers1,2
and J.-P. Ampuero1
1 Seismological Laboratory, California Institute of Technology, Pasadena, USA
2 now at Institut des Sciences de la Terre, Universit´e Joseph Fourier, Grenoble, France
1 Station Selection1
We include in our analysis waveform data from all stations in the target area that are2
available from the Southern California Earthquake Data Center (SCEDC) (Fig. S1). The3
set consists of borehole stations from the Plate Boundary Observatory (PB) and surface4
stations from the California Integrated Seismic Network (CI) and the Anza Network (AZ).5
Further station selection, as described in the next paragraph, is based on the noise level6
of the horizontal components between 2 and 8 Hz, a typical frequency band for tremor7
detection in other regions.8
A representative daily noise level for each station is defined as follows. Envelopes of 2-8 Hz9
bandpass filtered horizontal velocity seismograms are filtered with a minute-long moving10
average to decrease the influence of very large amplitude transients (e.g. earthquakes). The11
rms is computed within the 48 non-overlapping 30-minute segments of the day. Finally,12


Source: Ampuero, Jean Paul - Division of Geological and Planetary Sciences, California Institute of Technology


Collections: Geosciences