9:15 AM - 9:30 AM
[J09-4-04] Expanding seismic surface waves measurements towards low periods with gravity measurements
In this presentation, it has been shown how simultaneous seismic and gravity records at the same locations allow studying very long period surface waves. For test purposes 4 seismometer-gravimeter pairs have been deployed in Poland. These configurations are placed at three locations, Borowa Gora Geodetic-Geophysical Observatory (BG), Jozefoslaw Astronomical-Geodetic Observatory (JOZE), and Lamkowko Satellite Observatory (LAMK). Three seismometers are paired with two types of LaCoste&Romberg spring gravimeters (ET and model G) at all those Observatories. Additionally one seismometer is co-located on the same pillar with the iGrav-027 superconducting gravimeter at BG location. During the test period from December 2016 to January 2017 several large teleseismic events were observed with well-formed surface waves. Together with expected next events they should give dispersion curves for long surface waves, as well as periods of free oscillations. The correlation of a broadband seismometer signal with different types of gravimetric sensors gives a possibility to analyze gravimeter noise components, in the instrumental and microseismic domains.