ROCHEFORT (BE)
Quarry blast29 October 2020
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 11:42:082020-10-29
- UTC
- 10:42:082020-10-29
Main parameters
| Date and time | 2020-10-29 10:42:08 UTC 2020-10-29 11:42:08 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.169° N, 5.258° E Uncertainty ± 0.7 km |
| Event ID | ROB 11195 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-10-29 23:09:50 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
- 2.7 – 72.5km
- Mean velocity, P wave
- 5.5km/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 0.34 s. S wave: 6 measurements, root-mean-square deviation 0.32 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 | 2.7 | 235 | 10:42:09.09+0.43 s | 10:42:09.48+0.82 s | 0.39 |
| GESGesves | 27.0 | 333 | 10:42:13.80+5.14 s | 10:42:16.95+8.29 s | 3.15 |
| CLAClavier | 28.0 | 6 | 10:42:13.82+5.16 s | 10:42:17.54+8.88 s | 3.72 |
| MRDMaredsous | 38.0 | 293 | 10:42:15.39+6.73 s | 10:42:20.45+11.79 s | 5.06 |
| DOUDourbes | 48.1 | 260 | 10:42:17.19+8.53 s | 10:42:23.48+14.82 s | 6.29 |
| HOUHouvegnez | 57.1 | 69 | 10:42:18.69+10.03 s | – | – |
| MEMHMembach | 72.5 | 47 | 10:42:22.53+13.87 s | 10:42:29.95+21.29 s | 7.42 |