Heerlerheide / Richterich fault.
Composite source NLCS003 corresponds to the SE section of the Heerlerheide fault (Figure S3), which is also known as the Richterich fault in Germany. It connects with the NW section of the Heerlerheide fault, which is part of BECS001, through a wide bend. Although both fault sections are usually mapped as a continuous line, we consider the SE section as a separate seismic source, because its slip rate is significantly (up to three times) lower than that of BECS001, as discussed below. Alternatively, the fault could have been joined with the Feldbiss fault in source NLCS002, but we chose not to do so as the distance between both faults increases southward to more than 5 km.
None
Not much data exist to assess the deformation rate of the southern section of the Heerlerheide fault. Houtgast et al. (2002) report only one displacement value: 9 m for the base of the Caberg 1 terrace (530 kyr BP), yielding a vertical displacement rate of 0.017 mm/yr. In Germany, Ahorner (1962) mapped a displacement of max. 18 m for the base of the Upper Main Terrace Sequence (in this area corresponding to the Simpelveld terrace of the East Meuse, c. 1.85 Ma old, on the map of Felder et al., 1989). This results in a vertical displacement rate of ~0.010 mm/yr, which is significantly lower than the deformation rate of BECS001 and NLCS002. For this reason, we decided not to include the southern section of the Heerlerheide fault in source BECS001, but rather to consider it as a separate source with a lower slip rate.
| ID | Fault section | Offset (m) | Time period | Deformation rate (mm/yr) | Reference |
|---|---|---|---|---|---|
| 38 | Displacement of base Caberg-1 terrace | 9 | Since 530 kyr | 0.017 | Based on data from Houtgast et al. (2002) |
| 39 | Displacement of base of Simpelveld terrace of the East Meuse R. | 18 | Since 1.85 Ma | 0.010 | Based on data from Ahorner (1962) and Felder et al. (1989) |
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