ROCHEFORT (BE)
Quarry blast29 September 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 12:15:482021-09-29
- UTC
- 10:15:482021-09-29
Main parameters
| Date and time | 2021-09-29 10:15:48 UTC 2021-09-29 12:15:48 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.160° N, 5.259° E Uncertainty ± 0.4 km |
| Event ID | ROB 14520 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-30 11:36:41 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
- 2.4 – 61.1km
- Mean velocity, P wave
- 5.9km/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: 5 measurements, root-mean-square deviation 0.06 s. S wave: 5 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)5 stations | |||||
| RCHRochefort | 2.4 | 256 | 10:15:49.50+0.57 s | 10:15:49.78+0.85 s | 0.28 |
| GESGesves | 27.9 | 334 | 10:15:53.95+5.02 s | 10:15:57.84+8.91 s | 3.89 |
| CLAClavier | 29.0 | 6 | 10:15:54.01+5.08 s | 10:15:58.10+9.17 s | 4.09 |
| DOUDourbes | 48.0 | 262 | 10:15:57.36+8.43 s | 10:16:03.49+14.56 s | 6.13 |
| KLBKalborn | 61.1 | 96 | 10:15:59.50+10.57 s | 10:16:07.46+18.53 s | 7.96 |