NAMUR (BE)
Quarry blast2 December 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 14:28:512020-12-02
- UTC
- 13:28:512020-12-02
Main parameters
| Date and time | 2020-12-02 13:28:51 UTC 2020-12-02 14:28:51 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.499° N, 4.964° E Uncertainty ± 0.7 km |
| Event ID | ROB 11460 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-12-02 23:06:29 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
- 10
- Epicentral distance
- 15.4 – 92.9km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.5km/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 0.30 s. S wave: 9 measurements, root-mean-square deviation 0.52 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)9 stations | |||||
| GESGesves | 15.4 | 145 | 13:28:54.10+2.71 s | 13:28:56.18+4.79 s | 2.08 |
| CLAClavier | 25.6 | 110 | 13:28:55.84+4.45 s | 13:28:59.24+7.85 s | 3.40 |
| MRDMaredsous | 26.0 | 213 | 13:28:56.09+4.70 s | 13:29:00.08+8.69 s | 3.99 |
| RCHRochefort | 42.6 | 154 | 13:28:58.96+7.57 s | 13:29:04.15+12.76 s | 5.19 |
| DOUDourbes | 52.1 | 210 | 13:29:01.02+9.63 s | 13:29:06.85+15.46 s | 5.83 |
| RQRRonquières | 53.7 | 283 | 13:29:00.81+9.42 s | – | – |
| SKQSteenkerque | 64.8 | 285 | 13:29:02.51+11.12 s | 13:29:10.59+19.20 s | 8.08 |
| MEMHMembach | 75.1 | 80 | 13:29:04.96+13.57 s | 13:29:13.92+22.53 s | 8.96 |
| KLBKalborn | 92.9 | 118 | 13:29:07.46+16.07 s | 13:29:17.24+25.85 s | 9.78 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 74.5 | 66 | 13:29:04.06+12.67 s | 13:29:13.60+22.21 s | 9.54 |