Background. The responsive element of the GNU-KV Russian gravimeter comprises a Golitsyn lowfrequency vertical seismograph, which outperforms modern industrial SM-3KV seismographs in terms sensitivity to ground vibrations. A team geophysicists at Sergo Ordzhonikidze State University for Geological Prospecting modified construction adapt this device work mode portable seismological station recor...

Off Cape Muroto area, along the Nankai Trough in southwest Japan, is a typical area with adjacent occurrences of slow and megathrust earthquakes. High-resolution monitoring earthquakes necessary to understand tectonic conditions. In off distributed acoustic sensing (DAS) measurement, which provides high-density strain data, has been conducted using offshore fiber-optic cable. We observed shallo...

The Mw 7.9 Denali fault earthquake ruptured segments of the Susitna Glacier, Denali, and Totschunda faults in central Alaska, providing a unique opportunity to look for intermediate-term (weeks to months) responses of active volcanoes to shaking from a large earthquake. The Alaska Volcano Observatory (AVO) monitors 24 volcanoes with seismograph networks. We examined one station per volcano. Dig...

The records of multiple Love and Rayleigh waves of the Alaska earthquake of 1964 were recovered from the 30-100 seismograph records at the WWSSN stations. The seismograms were equalized to a propagation distance of 9rr/2 (equivalent to G5 and R5 at • -r/2). These seismograms were compared with synthetic seismograms for radiation pattern and amplitude to estimate various source parameters. The s...

Long-period wave propagation in the upper mantle is investigated by constructing synthetic seismograms for proposed models. A model consisting of spherical layers is assumed. Generalized ray theory and the Cagniard-de Hoop method is used to obtain the transient response. Preliminary calculations on producing the phases P and P P by ray summation out to periods of 50 sec is demonstrated, and syn...

The best constraints on the internal structures of giant planets have historically originated from measurements their gravity fields1–3. These data are inherently mostly sensitive to a planet’s outer regions, stymieing efforts measure mass and compactness cores Jupiter2,4,5 Saturn6,7. However, studies Saturn’s rings detected waves driven by pulsation modes within planet8–11, offering independen...

[1] In order to use ambient seismic noise for mapping Earth’s structure, it is important to understand the spatiotemporal characteristics of the noise field. This study uses data collected during four austral winter months of 2002 to investigate New Zealand’s ambient seismic noise field in the double-ocean-wave-frequency range (0.1–0.3 Hz). It is shown via beamforming analysis that there are tw...