Precursor Character of Bioelectric Potentialof Silk Tree Priorto Earthquake
Su Cong · Earthquake Research in Shanxi · 1999
The earthquakes of observation to silk tree in Earthquake Observation Station of Taiyuan Steel Group Company are introduced .The precur sor shape and observation achievement of bioelectric potentials of silk tree is sum marized .It is thought that silk tree have the preferable reflecting earthquake ability . Generally ,th e precursor anomalies of bioelectric potential of silk tree appeared in several hour and several days before earth quake .The reflecting ratio of greaterthan 3 .0 magnitude earthquake reaches 80 percentin 100km .The reflecting ratio of grea ter than 4 .5 magni tude earthquake reaches 77 percent in 500 km . The reflecting r atio of greaterthan 5 .5 magnitude earthquake reaches 66 percent in 1 000 km .