A temporary seismographic network with twelve three-component digital stations was deployed in the Chinshan-Tanshui area, northern Taiwan in 1989/1990. Data recorded by this network together with those by three stations of the Taiwan Telemetered Seismographic Network (TTSN) were analyzed to determine the characteristics of the Chinshan fault. Both the distributions of the P-wave travel time residuals and t □□ values indicate that the Chinshan fault might exist at the location that is inferred by surface geologic data. This fault reveals low seismicity. The focal depth profile shows the dip of the fault is about 55° to the southeast. The activity of the Chinshan fault may be normal or thrust, depending on the stress pattern in this area.
