Abstract
We present a unique catalogue of full moment tensors (MTs) of microearthquakes that occurred in West Bohemia, Czech Republic, in the period from 2008 to 2018. The catalogue is exceptional in several aspects: (1) it represents an extraordinary extensive dataset of more than 5.000 MTs, (2) it covers a long period of seismicity in the studied area, during which several prominent earthquake swarms took place, (3) the locations and retrieved MTs of microearthquakes are of a high accuracy. Additionally, we provide three-component records at the West Bohemia (WEBNET) seismic stations, the velocity model in the region, and the technical specification of the stations. The dataset is ideal for being utilized by a large community of researchers for various seismological purposes, e.g., for studies of (1) the migration of foci and the spatiotemporal evolution of seismicity, (2) redistribution of stress during periods of intense seismicity, (3) the interaction of faults, (4) the Coulomb stress along the faults and local stress anomalies connected to fault irregularities, (5) diffusivity of fluids along the activated faults, or (6) the time-dependent seismic risk due to the migration of seismicity in the region. In addition, the dataset is optimum for developing and testing new inversions for MTs and for tectonic stress. Since most of the earthquakes are non-shear, the dataset can contribute to studies of non-double-couple components of MTs and their relation to shear-tensile fracturing and/or seismic anisotropy in the focal zone.
Highlights
The seismic moment tensor (MT) describes equivalent body forces acting at an earthquake source (Knopoff and Randall, 1970)
We present recordings, locations and high-quality moment tensors of 5182 microearthquakes that occurred in the West Bohemia geothermal region, Czech Republic in the period from 2008 to 2018
Their locations were calculated by the double-difference location method and the moment tensors were determined using the moment tensor inversion of P waves based on the principal component analysis
Summary
The seismic moment tensor (MT) describes equivalent body forces acting at an earthquake source (Knopoff and Randall, 1970). Since earthquakes do not occur separately but in sequences, it is necessary to compile high-quality MT catalogues for understanding origins of seismicity, tectonic stress regime and seismic energy release of any region under study In this way, we can identify prominent periods of seismicity, trace faults and fault segments, monitor migration of earthquake foci, analyse interactions of nearby or intersecting faults, and map the fluid flow along the fault systems in the focal zone (Vavryčuk et al, 2021). The microearthquakes were monitored by the West Bohemia local seismic network WEBNET (Horálek et al., 2000; Fischer et al, 2010). The West Bohemia region is characterized by a continuous background seismicity scattered over the whole region interrupted by earthquake swarm sequences located mostly in the Nový Kostel focal zone. The most intense periods of seismicity in 2008, 2011, 2014, 2017 and 2018 (Figures 1c and 2) All these sequences are typical earthquake swarms except for the seismic activity in 2014, which was exceptional. Ratio vP/vS is 1.70 and ratio QP/QS is 2
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call