https://journal.geophysicsjournal.com/JofG/issue/feed Journal of Geophysics 2019-10-12T12:52:09+00:00 Editor-in-Chief, J. Geophys. editor@geophysicsjournal.com Open Journal Systems <p><strong>Journal of Geophysics</strong> (<em>J. Geophys.</em>) is the world's oldest and premier geophysical journal. The journal publishes research of great importance to geosciences, primarily in the areas of theoretical and applied geophysics, tectonophysics, seismology, physical and space geodesy, mathematical geodesy and geophysics, geodynamics, planetary physics, and atmospheric physics. (<a href="/JofG/about#nav-menu">more...</a>)</p> https://journal.geophysicsjournal.com/JofG/article/view/29 Tomographic imaging of the Andravida blind strike-slip fault (Western Greece) 2019-10-12T12:47:36+00:00 A. Karakonstantis akarakon@geol.uoa.gr K. Pavlou kpavlou@geol.uoa.gr V. Kapetanidis vkapetan@geol.uoa.gr <p>On 8 June 2008 at 12:25 GMT, a large (M<sub>w</sub>6.4) earthquake occurred NE of the town of Andravida in Western Peloponnese, Greece – an area characterized by high seismicity during the last decade. In this study, the local velocity structure of the Andravida Fault Zone (AFZ) is investigated primarily using data recorded during the period 2012-2017 by the Hellenic Unified Seismological Network (HUSN). We selected about 1,500 seismic events recorded by the local HUSN stations as well as the Hellenic Strong-Motion Network (HSMN). By applying tomographic inversion, we produced and interpreted 3D models of V<sub>P</sub>, V<sub>S</sub>, and V<sub>P</sub>/V<sub>S</sub> ratio in the study area. The spatial distribution of the aftershocks, as well as the 3D model derived by Local Earthquake Tomography (LET), provided evidence for the rupture plane. Surface breaks and minor faults are found to be oblique to the main direction of the AFZ, as a result of a restraining bend in Mtn. Movri and the formation of a positive flower-structure in the shallow layers of the upper crust.</p> <p><a href="https://scholar.google.com/scholar?cluster=5001220698575054765" target="_blank" rel="noopener"><img class="scholar" title="Google Scholar" src="/public/site/images/JoGeoph/gs.png" alt="Google Scholar"></a> &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; <strong>ARK</strong>:<a title="ARK Identifier" href="https://n2t.net/ark:/88439/x014750" target="_blank" rel="noopener">/88439/x014750</a> &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; <a target="_blank" rel="noopener"><img class="scholar" title="Copyright Clearance Center" src="/public/site/images/JoGeoph/ccc.png" alt="Copyright Clearance Center"></a> <a title="Copyright Clearance Center" href="https://www.copyright.com/ccc/openurl.do?issn=2643-2994&amp;WT.mc.id=Journal of Geophysics" target="_blank" rel="noopener">Reprints &amp; Permissions</a></p> <p>&nbsp;</p> 2019-07-12T00:00:00+00:00 Copyright (c) https://journal.geophysicsjournal.com/JofG/article/view/31 Earth body resonance 2019-10-12T12:52:09+00:00 M. Omerbashich hm@royalfamily.ba <p>The full range of 72h-forced, 72 superharmonic resonance periods, is detected in time-series of all 866 earthquakes of (robust averages of) M<sub>w</sub>5.6+ from USGS, EMSC, and GFZ, 2015-2019 catalogs. The resonance is in the 55’–15 days long-periodic band (0.303 mHz–0.771605 μHz) at 99–67% confidence. Moreover, omitting of the 21 overrepresenting events has improved the result. The signal is clear, strong, and stable – demonstrating beyond doubt that M<sub>w</sub>6.2+ seismicity arises due to long-periodic resonance. Remarkably, the natural mode’s cluster was detected too; it averaged 60.1’, while the overall strongest resonance period was also 59.9’, at 2.3 var%, or to within the 1Hz sampling rate – revealing that the 72 h forcer is the modulator of the Earth’s natural period via synchronization. The dominance property of the forcer also follows from detection of its many other fractional multiples: 14/5, 3/2, 5/12, 5/36, etc. After Schumann resonance discovery in the short band (extremely long band of the EM Spectrum), this is the second report ever of a full resonance bundle in any global data, and the first ever in tectonic earthquakes occurrences. The M<sub>w</sub>6.2+ seismotectonics arises via resonance-rupture response of tectonic plates and regions to the resonant phase or its fractional multiples. Fundamental questions of geophysics including earthquake prediction can be solved if the Earth is taken to be a multi-oscillator nonlinear system. As an immediate benefit, the find enables a reliable partial seismic anti-forecasting (prediction of seismic quiescence), months ahead globally. This discovery of mechanically induced extreme-band energy on Earth invalidates the main (heat-transfer) geophysical hypothesis and thus should drastically diminish the role of chemistry in geosciences, specifically of geochemistry.</p> <p><a href="https://scholar.google.com/scholar?cluster=3884139320521185722" target="_blank" rel="noopener"><img class="scholar" title="Google Scholar" src="/public/site/images/JoGeoph/gs.png" alt="Google Scholar"></a> &nbsp;&nbsp;&nbsp; <strong>ARK</strong>:<a title="ARK Identifier" href="https://n2t.net/ark:/88439/x020219" target="_blank" rel="noopener">/88439/x020219</a> &nbsp;&nbsp;&nbsp; <a target="_blank" rel="noopener"><img class="scholar" title="Copyright Clearance Center" src="/public/site/images/JoGeoph/ccc.png" alt="Copyright Clearance Center"></a> <a title="Copyright Clearance Center" href="https://www.copyright.com/ccc/openurl.do?issn=2643-2994&amp;WT.mc.id=Journal of Geophysics" target="_blank" rel="noopener">Reprints &amp; Permissions</a></p> <p><a href="https://doi.org/10.5281/zenodo.2646487" target="_blank" rel="noopener"><span style="text-decoration: underline;"><img class="scholar" title="CERN Zenodo" src="/public/site/images/JoGeoph/cern-zenodo.png" alt="CERN Zenodo"></span></a> &nbsp;&nbsp;&nbsp; <strong>DOI</strong>:<a title="DOI Identifier" href="https://doi.org/10.5281/zenodo.2646487" target="_blank" rel="noopener">10.5281/zenodo.2646487</a> | <strong>Online first</strong>: 18 April 2019, CERN</p> <p>&nbsp;</p> 2019-08-05T00:00:00+00:00 Copyright (c)