A scanning method of detecting an earthquake

我们提出了一种探测和定位地震的扫描方法。我们假设研究区域的三维网格点和时间网格点。为了探测地震，我们计算了所有网格点的观测波形的相似度。用这种方法探测到的震源的分辨率取决于间隔的大小。这种方法适用于通过观察特定区域和地震分离（如群震或余震活动）来检测前震活动。我们将该方法应用于测试性能和稳定性：首先，我们使用了1997年在Magna Fossa北部进行的受控源实验的数据，在那里我们进行了反射剖面分析。我们可以用已知的震源位置来评价这种方法。接下来，我们将该方法应用于日古-志雄地区的遥测地震观测数据。结果表明，该方法可以很好地检测实际数据中的小事件。

We proposed a scanning method of detecting and locating an earthquake. We assumed 3-D and time grid points in the studied area. To detect an earthquake, we calculated a semblance of observed waveforms about all the grid points. A resolution of a hypocenter of an earthquake detected by this method depends on a size of spacing. This method is applicable for a detection of a foreshock activity by watching a specified area and a separation of earthquakes such as swarm earthquakes or an aftershock activity.We applied the method to test the performance and stability: First we used data from a controlled source experiment conducted in the northern Fossa Magna, where we carried out reflection profiling in 1997. We could evaluate the method with a known location of seismic source. Next we applied the method to data obtained by a telemetered seismic observation at Nikko-Ashio area. We found that the method worked well to detect small event in real data.