MARCHE-EN-FAMENNE (BE)
Quarry blast21 October 2020
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 11:48:582020-10-21
- UTC
- 09:48:582020-10-21
Main parameters
| Date and time | 2020-10-21 09:48:58 UTC 2020-10-21 11:48:58 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.185° N, 5.254° E Uncertainty ± 0.6 km |
| Event ID | ROB 11135 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-10-21 23:06:42 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
- 7
- Epicentral distance
- 3.8 – 61.8km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.4km/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: 7 measurements, root-mean-square deviation 0.31 s. S wave: 7 measurements, root-mean-square deviation 0.18 s.
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)7 stations | |||||
| RCHRochefort | 3.8 | 210 | 09:48:59.00+0.72 s | 09:48:59.74+1.46 s | 0.74 |
| GESGesves | 25.3 | 332 | 09:49:03.10+4.82 s | 09:49:05.91+7.63 s | 2.81 |
| CLAClavier | 26.3 | 7 | 09:49:03.23+4.95 s | 09:49:06.67+8.39 s | 3.44 |
| MRDMaredsous | 37.0 | 291 | 09:49:04.37+6.09 s | 09:49:09.78+11.50 s | 5.41 |
| DOUDourbes | 48.2 | 258 | 09:49:06.18+7.90 s | 09:49:12.82+14.54 s | 6.64 |
| HOUHouvegnez | 56.8 | 70 | 09:49:08.29+10.01 s | 09:49:15.29+17.01 s | 7.00 |
| KLBKalborn | 61.8 | 98 | 09:49:09.14+10.86 s | 09:49:16.65+18.37 s | 7.51 |