Science. 1974 Sep 6;185(4154):855-7. doi: 10.1126/science.185.4154.855.
A 24 percent precursory change in apparent electrical resistivity was observed before a magnitude 3.9 earthquake of strike-slip nature on the San Andreas fault in central California. The experimental configuration and numerical calculations suggest that the change is associated with a volume at depth rather than some near-surface phenomenon. The character and duration of the precursor period agree well with those of other earthquake studies and support a dilatant earthquake mechanism model.
在加利福尼亚州中部圣安德烈亚斯断层发生 3.9 级走滑型地震之前，观测到视电阻率有 24%的前兆变化。实验配置和数值计算表明，这种变化与深部体积有关，而不是与某些近地表现象有关。前兆期间的特征和持续时间与其他地震研究非常吻合，支持了张性地震机制模型。
