[M-IS04] Interdisciplinary studies on pre-earthquake processes

[MIS04-14] Mechanisms of Lithosphere, atmosphere and ionosphere couplings before earthquakes and volcanos: differences and analogies

*Dedalo Marchetti¹、Kaiguang Zhu¹、Yiqun Zhang¹、Essam Ghamry²、Guido Ventura³、Alessandro Piscini³、Xuhui Shen⁴、Rui Yan⁵、Zeren Zhima⁵、Ting Wang¹、Wenqi Chen¹、Yuqi Cheng¹、Mengxuan Fan¹、Jiami Wen¹、Donghua Zhang¹、Hanshuo Zhang¹ (1.College of Instrumentation and Electrical Engineering, Jilin University, Changchun, 130061, China、2.National Research Institute of Astronomy and Geophysics, 11421 Helwan, Cairo, Egypt、3.Istituto Nazionale di Geofisica e Vulcanologia, 00143, Rome, Italy、4.National Space Science Center, Chinese Academy of Science, 100085, Beijing, China、5.Space Observation Research Center, National Institute of Natural Hazards, MEMC, China)

キーワード：Lithosphere, Atmosphere, Ionosphere, Coupling, pre-earthqauke processes

Several studies have reported anomalies in the lithosphere, atmosphere and ionosphere before earthquakes and volcano eruptions. Different theories have been proposed to explain the possible coupling between the geospheres. Some theories predict a pure electromagnetic coupling, some others a chain of phenomena induced by the release of radon or positive charges known as p-holes. Further studies also proposed Acoustic gravity waves caused by thermal heating close to the ground.
We have investigated by a multi-parametric approach several single earthquakes and some volcano eruptions in the last years; among them, Mw=6.7 Lushan 2013, Mw=7.5 Indonesia 2018, Mw 7.7 Jamaica 2020 earthquakes and VEI=3 La Palma 2021 volcano eruption.
For each case study, datasets from the geo-layers have been retrieved, and anomalies have been extracted by several techniques. The sequence of anomalies, in some cases, creates patterns that accelerate toward the earthquake. Despite this, the sequence of involved parameters and geo-layers is different.
In this presentation, we will show some examples of possible lithosphere, atmosphere and ionosphere coupling before the above-cited earthquakes, La Palma volcano eruption and other case studies. We will compare them in the light of the several theories that are only apparently in contrast to each other as they probably describe several ways how our planet can be affected by a large natural hazard.
In fact, studying different case studies, it seems that more coupling mechanisms are possible. From preliminary statistical investigations, it will also be shown how the focal mechanism, the location (sea or land) and the magnitude of the incoming earthquake can play an essential role in the phenomena we can expect before their occurrence.