HILLESHEIM (DE)
Suspected quarry blast28 July 2020
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:08:492020-07-28
- UTC
- 10:08:492020-07-28
Main parameters
| Date and time | 2020-07-28 10:08:49 UTC 2020-07-28 12:08:49 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.297° N, 6.642° E Uncertainty ± 0.9 km |
| Event ID | ROB 10555 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-07-28 15:05:53 Belgian time
Location map
- Epicentre
- Station that recorded the event
Arrival times at the stations
Each station first records the P wave, the fastest, then the S wave. The farther a station is from the epicentre, the later the waves reach it and the wider the gap between the two.
- Stations
- 13
- Epicentral distance
- 43.9 – 152.2km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.3km/s
- P wave
- S wave
- Curve fitted to the measurements
Notes and method
Curves: travel time of a direct wave in a homogeneous medium. The velocity of each wave and an origin-time shift, common to both, are fitted to the measurements by least squares. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 10 measurements, root-mean-square deviation 0.43 s. S wave: 6 measurements, root-mean-square deviation 0.49 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
Station measurements
P- and S-wave arrivals and ground displacement measured at each station. Click a column heading to change the order.
| km | ° | UTC | UTC | s | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)11 stations | |||||
| KLBKalborn | 43.9 | 240 | 10:08:56.80+7.06 s | 10:09:03.43+13.69 s | 6.63 |
| HOUHouvegnez | 45.8 | 278 | 10:08:57.49+7.75 s | – | – |
| MRGMont Rigi | 46.8 | 301 | 10:08:58.11+8.37 s | 10:09:03.96+14.22 s | 5.85 |
| VIAVianden | 51.1 | 218 | 10:08:58.04+8.30 s | 10:09:04.41+14.67 s | 6.37 |
| MEMHMembach | 56.7 | 308 | 10:08:59.71+9.97 s | 10:09:07.72+17.98 s | 8.01 |
| CLAClavier | 96.3 | 279 | 10:09:05.94+16.20 s | – | – |
| RCHRochefort | 102.2 | 262 | 10:09:06.39+16.65 s | – | – |
| GESGesves | 111.1 | 276 | 10:09:08.21+18.47 s | – | – |
| MRDMaredsous | 133.5 | 271 | 10:09:13.10+23.36 s | 10:09:29.95+40.21 s | 16.85 |
| DOUDourbes | 147.9 | 262 | 10:09:14.94+25.20 s | 10:09:33.81+44.07 s | 18.87 |
| DSLBDessel | 152.2 | 314 | 10:09:15.53+25.79 s | 10:09:34.04+44.30 s | 18.51 |
| Dutch seismic network (KNMI)2 stations | |||||
| HGNHeimansgroeve | 72.3 | 316 | 10:09:02.34+12.60 s | 10:09:11.96+22.22 s | 9.62 |
| VKBValkenburg | 87.7 | 317 | 10:09:05.40+15.66 s | 10:09:16.59+26.85 s | 11.19 |