Since end of the 90s of the last century the seismological station Moxa was extended and developed into the modern Geodynamic Observatory. It comprises also the new installation of borehole-tilt meters in front of the...Since end of the 90s of the last century the seismological station Moxa was extended and developed into the modern Geodynamic Observatory. It comprises also the new installation of borehole-tilt meters in front of the observatory building and laser-strain meters in the gallery. The question arises how non-tidal signals are displayed in the measured time series. The investigation of such signals which can be caused naturally or man-made, can result in different sensitivities for the various tilt- and strainmeter systems, e.g. regarding barometric pressure impacts and hydrological induced pore pressure effects.展开更多
The comparison of tiltmeter and strainmeter data in the periods of the strongest earthquakes with tropical cyclone activities in the World Ocean during Januarye April 2014 is made.Main features of the observed co-seis...The comparison of tiltmeter and strainmeter data in the periods of the strongest earthquakes with tropical cyclone activities in the World Ocean during Januarye April 2014 is made.Main features of the observed co-seismic tilt and strain processes are consistent with the results obtained for the strongest events during 1997-2004.The time-frequency data analysis and the comparison of the analysis results with the anomalous geomagnetic and ionospheric activity come to an agreement with the observed phenomena.The obtained results have allowed the triggering mechanism of seismicity to be proposed.The process begins as spatial and temporal swings of the regions of tropical cyclone origins and the basins of their activity.The powerful cyclone development accompanies a wide range of earthquake precursory phenomena,including abnormal behavior of ultra-wideband(0.002 m Hz-3 Hz)Earth’s oscillations,which can be recorded at far distances up to 1000-10,000 km.The daily dissipation energy of the most powerful tropical cyclone(hurricane,typhoon)is estimated to have same order of magnitude as the energy released by an event of Mw 7-9,as well,atmospheric depressions are big enough to trigger a forthcoming strong earthquake.The triggering mechanism could be caused by quasi-static and timedependent surface loading that produces vertical tension and shear deformations.This loading affects the seafloor and coastline where they fall close to the adjacent tectonic plate boundaries.展开更多
文摘Since end of the 90s of the last century the seismological station Moxa was extended and developed into the modern Geodynamic Observatory. It comprises also the new installation of borehole-tilt meters in front of the observatory building and laser-strain meters in the gallery. The question arises how non-tidal signals are displayed in the measured time series. The investigation of such signals which can be caused naturally or man-made, can result in different sensitivities for the various tilt- and strainmeter systems, e.g. regarding barometric pressure impacts and hydrological induced pore pressure effects.
基金supported by the Czech Geo/EPOS projects(No.LM2010008 and LM-2015079)
文摘The comparison of tiltmeter and strainmeter data in the periods of the strongest earthquakes with tropical cyclone activities in the World Ocean during Januarye April 2014 is made.Main features of the observed co-seismic tilt and strain processes are consistent with the results obtained for the strongest events during 1997-2004.The time-frequency data analysis and the comparison of the analysis results with the anomalous geomagnetic and ionospheric activity come to an agreement with the observed phenomena.The obtained results have allowed the triggering mechanism of seismicity to be proposed.The process begins as spatial and temporal swings of the regions of tropical cyclone origins and the basins of their activity.The powerful cyclone development accompanies a wide range of earthquake precursory phenomena,including abnormal behavior of ultra-wideband(0.002 m Hz-3 Hz)Earth’s oscillations,which can be recorded at far distances up to 1000-10,000 km.The daily dissipation energy of the most powerful tropical cyclone(hurricane,typhoon)is estimated to have same order of magnitude as the energy released by an event of Mw 7-9,as well,atmospheric depressions are big enough to trigger a forthcoming strong earthquake.The triggering mechanism could be caused by quasi-static and timedependent surface loading that produces vertical tension and shear deformations.This loading affects the seafloor and coastline where they fall close to the adjacent tectonic plate boundaries.
