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Looking for Earthquake Precursors from Space: a Critical Review

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Looking for Earthquake Precursors from Space: a Critical Review REVIEW published: 14 July 2021 doi: 10.3389/feart.2021.676775 Looking for Earthquake Precursors From Space: A Critical Review Piergiorgio Picozza 1,2,3*, Livio Conti 2,3 and Alessandro Sotgiu 1,2 1University of Rome Tor Vergata, Rome, Italy, 2INFN - Sezione Roma Tor Vergata, Rome, Italy, 3Uninettuno University, Rome, Italy Starting from late seventies, many observations have been reported about observations in space of signals reconciled with earthquakes and claimed as possible preseismic measurements. The detected parameters range from electromagnetic field components (in a large band of frequencies) to plasmas parameters; from particles detection to thermal anomalies; etc. Up to the DEMETER mission, the analyses have been carried out on datasets gathered by not devoted satellites. Even beyond the results obtained, the DEMETER mission has constituted a milestone for space-based investigations of seismo-associated phenomena drawing a baseline for next missions with respect instruments, observational strategy and measurements uncertainty. Nowadays, the CSES-01 satellite – developed within a sino-italian collaboration with the participation also of Austrian Institutes – represents the most advanced mission for investigating near-Earth electromagnetic environment Edited by: aimed at extending the observation of earthquake precursors to a long time series. The Dimitar Ouzounov, benefit of the mission is even higher by considering that CSES-01 is the first of a Chapman University, United States program of several LEO small satellites, the second of which will be launched on 2023 Reviewed by: with the same instruments and orbit of CSES-01,butwithashiftofhalfofanorbitin Angelo De Santis, University of Studies G. d’Annunzio order to monitor each trace twice per orbit. The article gives a short survey of space- Chieti and Pescara, Italy based observations of preseismic phenomena from the early studies up to the more Michel Parrot, fi UMR7328 Laboratoire de physique et recent ones, critically reviewing results, hypotheses and trends in this research eld. chimie de l’environnement et de The supposed physical processes proposed to explain the observations are still unable ’ l Espace, France to explain the large variety of the phenomenology, the statistical significance of the *Correspondence: results are highly debated, and more in general a common consensus is still missing. Piergiorgio Picozza [email protected] Anyway, the investigation of the seismo-associated phenomena from space is a challenge for near future Earth observation. Specialty section: This article was submitted to Keywords: earthquake precursors, trapped particles, space weather, DEMETER, CSES, acoustic gravity waves, Geohazards and Georisks, HEPD a section of the journal Frontiers in Earth Science INTRODUCTION Received: 08 March 2021 Accepted: 28 June 2021 The key ingredient for studying the earthquake preparation process - and ideally for forecasting its Published: 14 July 2021 occurrence - is to point out the existence of possible earthquake precursors (on long, middle, or short Citation: temporal scale) as well as their detection as a function of the distance (from the focal area of the Picozza P, Conti L and Sotgiu A (2021) Looking for Earthquake Precursors impinging event). An extended review can be found for example in Tronin (2006), Hayakawa (2015), From Space: A Critical Review. Pulinets and Ouzounov (2018), Parrot (2018), Ouzounov et al. (2018), Pulinets and Ouzounov Front. Earth Sci. 9:676775. (2018). Beyond the classification as a function of the time delay with respect the seismic event, doi: 10.3389/feart.2021.676775 precursors can be further distinguished on the spatial scale as a function of the detection distance and Frontiers in Earth Science | www.frontiersin.org 1 July 2021 | Volume 9 | Article 676775 Picozza et al. Looking for Earthquake Precursors From Space their localization or diffusion. In fact, some processes, candidate which, in our opinion, are valuable insights - that deserve to be to be considered such as precursors, can be detected around the investigated with the utmost precision and highest statistical seismic focal area (local precursors) even though eventually at accuracy - of the coupling mechanism existing between the significant distance. Due to the topology of the geomagnetic field, lithosphere and the near-Earth environment (De Santis et al., other possible precursors can be detected not only over the 2015). For a review about the main earthquake precursors epicentre, but also near to its magnetically conjugated region observed on ground (and further references about ground- or along the field line with footprint on the epicentre (diffused space multi-parametric analyses) the interested reader is precursors). Finally, a further class of precursors could be addressed to the twin article of Conti et al. (2021) in this constituted by fluctuations detectable not only along a same issue. The layout of the article is as follow. We will geomagnetic flux tube associated to the epicentre, but spread adopt a quasi-chronological approach discussing observations in suitable iono-magnetospheric “shell” (distributed precursors). carried out in space before (section Seismo-Electromagnetic Nowadays, earthquake forecasting is far from being reached and Perturbations Detected in Space by Non-Dedicated Missions) the debated about earthquake precursors is still open. and after (section DEMETER Satellite Observations) the Nevertheless, even though not conclusive results have been DEMETER mission that has been the first satellite devoted to obtained, a large amount of measurements have been gathered investigate precursors from space. Then we will present the first worldwide with a large variety of methodology and the results from the CSES satellite (section First Analyses From the investigations of many different physical quantities and CSES Satellite Mission) that is the first mission of a program parameters, both on ground and in space. Unexpectedly, there including several satellites devoted to investigate seismo-induced is a problem of repeatability and confirmation of claimed results phenomena in the near-Earth electromagnetic environment. by different authors using the same methodology and/or Finally, in section Connecting Perturbations on Ground and in analyzing the same parameters. Whereas the co-seismic effects Space we will summarize some ideas about the physical in the atmosphere are well-established (Tanimoto et al., 2015), mechanism for coupling lithosphere with lower and upper the possible pre-earthquake phenomena on the surface as well as layers of the atmosphere up to the ionosphere. the coupling between lithosphere, atmosphere and ionosphere (called LAIC for short, hereafter) are still disputed (e.g., Geller, 1997, Geller et al., 1997; Hough, 2020 and references therein). As SEISMO-ELECTROMAGNETIC it is very difficult to detail a debate (in which facts and views are PERTURBATIONS DETECTED IN SPACE sometimes mixed), we summarize only some of the main recent BY NON-DEDICATED MISSIONS “trends” of discussion. A general skepticism about ground and space precursors (including thermal anomalies due to their Seismic events are the last stage of a long preparation process “natural variability” and more in general for the “a posteriori” generated by a continuous and variable tectonic stress (Scholz, findings of the anomalies) is advocated by Jordan et al. (2011), 2002; Olaiz et al., 2009). Many attempts have been done in order Nakatani (2020) and - especially for seismic precursors - by to monitor on ground the earthquake preparation phase and the Scholz (2019), although more recent results (e.g., Gulia and underlying physical processes on specific fault systems Wiemer, 2019) might change the perspective. Wang and (Kanamori, 2003), but the involved processes are deep, slow Burgmann (2019) have questioned the reliability of precursory and complex. Since some tens of years, the possibility to gravity changes; Helman (2020) has written in favor of the pre- remote sensing earthquakes though their effects in the near- seismic character of electrical signals, while Warden et al. (2020) Earth space has been explored. In order to explain the effects of support a critical view on ULF anomalies. Woith (2015) reviewed the LAIC, Pulinets and Ouzounov (2011) proposed a model - the “complexity” of investigating radon anomalies both as based on rising of gas and fluid toward the surface in the seismic precursors to earthquakes and beyond this specific preparation phase - that could take into account the last stages of interpretation. In the debate on preseismic ionospheric the long-term seismic phase. Other hypotheses have been anomalies, negative positions have been expressed by suggested by Sorokin et al. (2001), Hayakawa and Molchanov Dautermann et al. (2007), Thomas et al. (2012), Kamogawa (2002), Liperovsky et al. (2008a), De Santis et al. (2017), De Santis and Kakinami (2013), Masci et al. (2015), Masci et al. (2017) et al. (2019a); etc. Freund (2011) proposed a mechanism, and an analysis of the statistical reliability of some TEC anomalies successfully tested in laboratory (Freund et al., 2007), based on can be found in Ikuta et al. (2020) and Tozzi et al. (2020). the theory of positive holes that could locally ionize the lower However, in a larger and reliable perspective, Kato and Ben- atmosphere and create instability in the ionosphere. Finally Kuo Zion (2021) and Pritchard et al. (2020) have highlighted the et al. (2011), Kuo et al. (2014) proposed
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