荷電粒子測定による発生メカニズムに関する研究(第2部室内岩石実験による電磁波放射特性に関する研究)

概要

論文の詳細を見る
Fracture of rocks associates emission of charged particles. In order to clarify if this phenomenon is responsible for any electromagnetic anomalies associated with earthquakes, the laboratory experiments were conducted to detect fracture stimulated charged-particle' semission or transient electric current in rocks using a fast operating charge detecting devise of high sensitivity. Electric charge signal (ECS) was detected in two ways, namely 1) a direct charge collection method using an electroconductive indenter serving as the collecting electrode and 2) an indirect collection method in which an electrode was placed on rocks at a specific distance from the indentation fracture zone. Thermally stimulated electron emission (TSEE) from granite was also measured using a gas-flow GM counter at temperature from room temperature up to 400℃. As the results, intense electric charge signal (ECS) were detected during the indentation-loading cycle when cracking occurred around the indent on granite and on moist andesite. It was also confirmed that the charge signal propagated through the rock media, in a manner that the ECS decayed as the distance between the indent and the electrode increased. The transient electric current density at the fracture zone was estimated to 10^<-9> A/cm^2 for coarse grained granite. Granite shows TSEE peak at temperatures of about 300and 400 C. TSEE peak at 400℃ is attributed to the release of trapped electrons at point defects (E' center). A possible mechanism for fracture-induced charge generation are discussed in relation to the geoelectric anomalies associated with earthquake.
1993-03-29

荷電粒子測定による発生メカニズムに関する研究(第2部室内岩石実験による電磁波放射特性に関する研究)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク

荷電粒子測定による発生メカニズムに関する研究(第2部 室内岩石実験による電磁波放射特性に関する研究)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク

荷電粒子測定による発生メカニズムに関する研究(第2部室内岩石実験による電磁波放射特性に関する研究)