ROCHEFORT (BE)
Quarry blast7 July 2021
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 11:57:092021-07-07
- UTC
- 09:57:092021-07-07
Main parameters
| Date and time | 2021-07-07 09:57:09 UTC 2021-07-07 11:57:09 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.189° N, 5.243° E Uncertainty ± 2.7 km |
| Event ID | ROB 13900 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-08 10:24:44 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
- 5
- Epicentral distance
- 4.0 – 62.7km
- Mean velocity, P wave
- 5.9km/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: 5 measurements, root-mean-square deviation 0.17 s. S wave: 5 measurements, root-mean-square deviation 0.16 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)5 stations | |||||
| RCHRochefort | 4.0 | 196 | 09:57:09.86+0.68 s | 09:57:10.47+1.29 s | 0.61 |
| GESGesves | 24.4 | 333 | 09:57:13.71+4.53 s | 09:57:16.56+7.38 s | 2.85 |
| CLAClavier | 25.9 | 9 | 09:57:14.04+4.86 s | 09:57:17.26+8.08 s | 3.22 |
| DOUDourbes | 47.5 | 257 | 09:57:17.53+8.35 s | 09:57:23.48+14.30 s | 5.95 |
| KLBKalborn | 62.7 | 99 | 09:57:19.96+10.78 s | 09:57:27.64+18.46 s | 7.68 |