FRASNES-LEZ-ANVAING (BE)
Quarry blast9 August 2022
- Magnitude
- 2.0ML
- Depth
- 18.3km ± 4.4
- Belgian time
- 13:00:142022-08-09
- UTC
- 11:00:142022-08-09
Main parameters
| Date and time | 2022-08-09 11:00:14 UTC 2022-08-09 13:00:14 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.699° N, 3.525° E Uncertainty ± 7.1 km |
| Depth of hypocenter | 18.3 ± 4.4 km |
| Event ID | ROB 16770 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-08-11 23:23:57 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
- 22.5 – 195.4km
- Mean velocity, P wave
- 6.1km/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. Hypocenter at a depth of 18.3 km. P wave: 6 measurements, root-mean-square deviation 0.41 s. S wave: 4 measurements, root-mean-square deviation 0.37 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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 | |||||
| LESLessines | 22.5 | 86 | 11:00:18.23+3.75 s | 11:00:23.12+8.64 s | 4.89 |
| SKQSteenkerque | 39.7 | 98 | 11:00:21.38+6.90 s | 11:00:27.27+12.79 s | 5.89 |
| BRQBracquegnies | 49.6 | 119 | 11:00:21.93+7.45 s | – | – |
| RQRRonquières | 50.6 | 101 | 11:00:23.10+8.62 s | – | – |
| SNFSeneffe | 57.7 | 111 | 11:00:23.87+9.39 s | 11:00:31.52+17.04 s | 7.65 |
| DOUDourbes | 101.5 | 131 | 11:00:31.07+16.59 s | 11:00:44.36+29.88 s | 13.29 |
| KLBKalborn | 195.4 | 109 | 11:00:45.88+31.40 s | – | – |