Joint perturbation of geoacoustic, emanation, and atmospheric electric fields at the boundary of the earth’s crust and the atmosphere before an earthquake

Oleg Rulenko,Yuriy Kuzmin,Yuriy Marapulets,Alexandra Solodchuk,B.M Shevtsov

doi:10.1051/e3sconf/20161100020

Abstract

The possibility of joint perturbation of geoacoustic, emanation and atmospheric electric fields by the Earth’s crust — atmosphere boundary before an earthquake is considered. In order to detect it, simultaneous registration of these fields was carried out in Kamchatka in August–October 2012. Synchronous anomalous disturbances were recorded 13 days before an earthquake with the magnitude Mw = 5.6 at the distance of 140 km from an epicenter. It may be considered to be a complex short-term precursor.

Highlights

The boundary between the lithosphere and the atmosphere is characterized by significant changes of properties of the contacting mediums, considerable flows of mass and energy, a wide list of simultaneously existing dissimilar fields and their interactions and transformations [1]
Joint analysis of the perturbations of different fields improves the reliability of detection of earthquake precursors and may be the basis for investigation of the process of their preparation [2], [3]
The anomalous disturbance of geoacoustic, emanation and atmospheric electric fields registered on October 2 may be considered to be a complex short-term precursor of the earthquake which occurred on October 15 with Mw = 5.6 and as the indication of the Earth’s crust effect on the surface atmosphere during its preparation

Summary

Introduction

The boundary between the lithosphere and the atmosphere is characterized by significant changes of properties of the contacting mediums, considerable flows of mass and energy, a wide list of simultaneously existing dissimilar fields and their interactions and transformations [1]. A constituent part of interaction of the solid and the gas geospheres is the lithosphere effect on the atmosphere It manifests partially in anomalous changes of geophysical fields in the near ground atmosphere in the result of geodynamic processes in the Earth’s crust and is intensive in seismically active regions at the final stage of earthquake preparation. It is generally accepted that mechanic processes play the main role in the preparation of a tectonic earthquake They cause changes of the Earth’s crust stress state which in the result of its inhomogeneous hierarchical block structure determine complicated spatial-temporal deformations of rocks, in particular their local tensions and compressions. Pre-seismic perturbations of these fields just like precursors in other fields, cause changes of the stress field in the zone of earthquake preparation They occur in the result of transformations of stress-deformation tensions of the near-surface sedimentary rocks at an observation point. The general factor promoting the considered processes is the fragmentariness of sedimentary rocks and, as a consequence, their high deformability

Observations and results

Findings

Conclusions