ROCHEFORT (BE)
Quarry blast4 September 2020
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 12:42:002020-09-04
- UTC
- 10:42:002020-09-04
Main parameters
| Date and time | 2020-09-04 10:42:00 UTC 2020-09-04 12:42:00 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.151° N, 5.275° E Uncertainty ± 1.8 km |
| Event ID | ROB 10800 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-09-04 16:14:44 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
- 3.4 – 59.9km
- Mean velocity, P wave
- 6.6km/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: 7 measurements, root-mean-square deviation 0.38 s. S wave: 6 measurements, root-mean-square deviation 0.17 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 | 3.4 | 278 | 10:42:01.33+0.82 s | 10:42:01.82+1.31 s | 0.49 |
| GESGesves | 29.3 | 333 | 10:42:06.20+5.69 s | 10:42:09.80+9.29 s | 3.60 |
| CLAClavier | 29.9 | 4 | 10:42:05.92+5.41 s | 10:42:10.19+9.68 s | 4.27 |
| MRDMaredsous | 39.9 | 295 | 10:42:07.51+7.00 s | 10:42:12.91+12.40 s | 5.40 |
| DOUDourbes | 49.0 | 263 | 10:42:08.69+8.18 s | 10:42:15.74+15.23 s | 7.05 |
| LCHLa Chartreuse | 59.0 | 23 | 10:42:09.69+9.18 s | – | – |
| KLBKalborn | 59.9 | 95 | 10:42:09.80+9.29 s | 10:42:19.21+18.70 s | 9.41 |