Publication Date:
2023-04-06
Description:
We present first data examples and an estimation of the magnitude of completeness for
two BlueSeis-3A rotational seismometers deployed in the West-Bohemia/Vogtland region.
The sensors show a surprisingly good sensitivity even for low magnitude events.
In seven months, the "Seismologie-Verbund zur Erdbebenbeobachtung in Mitteldeutschland" reported 521 events
occurring within a distance of up to 30 km. Based on the signal-noise-ratio, we estimate a magnitude of completeness around a local magnitude of 0.3 for the rotational sensors compared to the completeness of the catalog of -0.7.
Moreover, we found that the transversal translation corresponds well to the vertical rotational component for a phase velocity of 2000 m/s and frequencies of 10 to 20 Hz.
The data are intended to complement waveform inversions for seismic moment tensors.
The study area is characterized by recurring seismic swarms, which are presumably driven by the migration of mantle fluids through the crust. In order to better understand the role of fluids in the earthquake mechanim a good resolution of the non-double-couple (i.e. volumetric and tensile) components of the seismic moment tensor is needed. In that regard, adding rotational data to the inversion has been shown beneficial in synthetic studies. The acquired data will present one of the first examples using field data to invert waveforms for the full seismic moment tensor.
Description:
poster
Keywords:
rotational seismology
;
BlueSeis
;
Vogtland/West-Bohemia
Language:
English
Type:
doc-type:conferenceObject
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