LESSINES (BE)
Quarry blast18 May 2022
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 12:44:442022-05-18
- UTC
- 10:44:442022-05-18
Main parameters
| Date and time | 2022-05-18 10:44:44 UTC 2022-05-18 12:44:44 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.721° N, 3.870° E Uncertainty ± 4.9 km |
| Event ID | ROB 16205 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-05-18 22:31:18 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
- 8
- Epicentral distance
- 2.3 – 106.8km
- 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: 8 measurements, root-mean-square deviation 0.57 s. S wave: 4 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)8 stations | |||||
| LESLessines | 2.3 | 239 | 10:44:45.47+0.51 s | 10:44:45.68+0.72 s | 0.21 |
| SKQSteenkerque | 16.8 | 118 | 10:44:48.20+3.24 s | 10:44:50.44+5.48 s | 2.24 |
| RQRRonquières | 28.2 | 117 | 10:44:49.96+5.00 s | – | – |
| BRQBracquegnies | 32.7 | 145 | 10:44:51.04+6.08 s | – | – |
| SNFSeneffe | 37.5 | 128 | 10:44:51.75+6.79 s | 10:44:56.35+11.39 s | 4.60 |
| TGATangissart | 47.8 | 105 | 10:44:53.50+8.54 s | 10:44:59.55+14.59 s | 6.05 |
| DOUDourbes | 86.6 | 143 | 10:45:01.11+16.15 s | – | – |
| CLAClavier | 106.8 | 108 | 10:45:02.29+17.33 s | – | – |