A set of four magnitude Ml ≥ 3.0 earthquakes including the magnitude Ml = 3.7 mainshock of the seismic sequence hitting the Lake Constance, Southern Germany, area in July–August 2019 was studied by means of bulletin and waveform data collected from 86 seismic stations of the Central Europe-Alpine region. The first single-event locations obtained using a uniform 1-D velocity model, and both fixed and free depths, showed residuals of the order of up ± 2.0 s, systematically affecting stations located in different areas of the study region. Namely, German stations to the northeast of the epicenters and French stations to the west exhibit negative residuals, while Italian stations located to the southeast are characterized by similarly large positive residuals. As a consequence, the epicentral coordinates were affected by a significant bias of the order of 4–5 km to the NNE. The locations were repeated applying a method that uses different velocity models for three groups of stations situated in different geological environments, obtaining more accurate locations. Moreover, the application of two methods of relative locations and joint hypocentral determination, without improving the absolute location of the master event, has shown that the sources of the four considered events are separated by distances of the order of one km both in horizontal coordinates and in depths. A particular attention has been paid to the geographical positions of the seismic stations used in the locations and their relationship with the known crustal features, such as the Moho depth and velocity anomalies in the studied region. Significant correlations between the observed travel time residuals and the crustal structure were obtained.

通过从德国南部86个地震台站收集的公告和波形数据，研究了一组四级Ml≥3.0级地震，包括袭击德国南部康斯坦茨湖地区2019年7月至8月地震序列的Ml = 3.7级主震。中欧-高山地区。使用统一的一维速度模型以及固定深度和自由深度获得的第一个单事件位置，显示的残差高达±2.0 s，系统地影响了位于研究区域不同区域的测站。即，位于震中东北部的德国台站和位于西部的法国台站显示负残差，而位于东南部的意大利台站也具有相似的大正残差。作为结果，震中中心坐标受NNE约4-5 km的显着偏差影响。使用一种方法对位置进行重复，该方法对位于不同地质环境中的三组站使用不同的速度模型，从而获得更准确的位置。此外，在不改善主事件绝对位置的情况下，采用两种相对位置和联合下摆确定方法的结果表明，四个被考虑事件的来源在水平坐标和水平坐标上都相距一公里的距离。深入。特别要注意的是在该位置使用的地震台站的地理位置及其与已知地壳特征的关系，例如研究区域内的莫霍面深度和速度异常。