MARCHE-LES-DAMES (BE)
Quarry blast1 March 2021
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 14:29:552021-03-01
- UTC
- 13:29:552021-03-01
Main parameters
| Date and time | 2021-03-01 13:29:55 UTC 2021-03-01 14:29:55 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.489° N, 4.971° E Uncertainty ± 1.1 km |
| Event ID | ROB 12605 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-03-01 14:45:54 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
- 12
- Epicentral distance
- 14.3 – 107.4km
- Mean velocity, P wave
- 5.6km/s
- Mean velocity, S wave
- 3.2km/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: 12 measurements, root-mean-square deviation 0.23 s. S wave: 11 measurements, root-mean-square deviation 0.75 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)12 stations | |||||
| GESGesves | 14.3 | 145 | 13:29:57.71+2.21 s | 13:29:59.43+3.93 s | 1.72 |
| CLAClavier | 24.8 | 108 | 13:29:59.61+4.11 s | 13:30:03.06+7.56 s | 3.45 |
| MRDMaredsous | 25.3 | 215 | 13:30:00.23+4.73 s | 13:30:03.93+8.43 s | 3.70 |
| TGATangissart | 34.3 | 292 | 13:30:01.42+5.92 s | 13:30:05.60+10.10 s | 4.18 |
| RCHRochefort | 41.5 | 154 | 13:30:02.70+7.20 s | 13:30:08.29+12.79 s | 5.59 |
| STISart Tilman | 43.3 | 76 | 13:30:03.15+7.65 s | – | – |
| DOUDourbes | 51.4 | 212 | 13:30:04.72+9.22 s | 13:30:09.98+14.48 s | 5.26 |
| RQRRonquières | 54.4 | 284 | 13:30:04.55+9.05 s | 13:30:12.12+16.62 s | 7.57 |
| MEMHMembach | 74.9 | 79 | 13:30:08.40+12.90 s | 13:30:18.43+22.93 s | 10.03 |
| MRGMont Rigi | 78.4 | 88 | 13:30:08.98+13.48 s | 13:30:19.95+24.45 s | 10.97 |
| KLBKalborn | 92.0 | 118 | 13:30:11.51+16.01 s | 13:30:22.32+26.82 s | 10.81 |
| VIAVianden | 107.4 | 125 | 13:30:14.53+19.03 s | 13:30:29.84+34.34 s | 15.31 |