【摘要】 本文用陕、甘、宁、青的地下水前兆观测资料，运用异常系列方法的思路，研究了四省区中强地震的中期前兆指标，并进一步探讨了渭河盆地及周边的地震形势。更多还原

【Abstract】 Using observed precursor data of underground water in Shaanxi-Gansu -Ningxia and Qinghai and abnormal series method, this paper studied the intermediate precursor indexes of moderate-strong earthquake in the four provinces and regions,further inquired into the seismic situation in the Weihe basin and vicinity.更多还原