LESSINES (BE)
Quarry blast5 July 2023
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 12:42:392023-07-05
- UTC
- 10:42:392023-07-05
Main parameters
| Date and time | 2023-07-05 10:42:39 UTC 2023-07-05 12:42:39 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.732° N, 3.868° E Uncertainty ± 22.5 km |
| Event ID | ROB 19850 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-07-10 12:16:53 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
- 4
- Epicentral distance
- 2.9 – 33.7km
- Mean velocity, P wave
- 5.6km/s
- Mean velocity, S wave
- 3.2km/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: 4 measurements, root-mean-square deviation 0.12 s. S wave: 4 measurements, root-mean-square deviation 0.22 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)4 stations | |||||
| LESLessines | 2.9 | 217 | 10:42:40.23+0.69 s | 10:42:40.45+0.91 s | 0.22 |
| SKQSteenkerque | 17.6 | 122 | 10:42:42.82+3.28 s | 10:42:44.61+5.07 s | 1.79 |
| RQRRonquières | 28.9 | 119 | 10:42:44.59+5.05 s | 10:42:48.66+9.12 s | 4.07 |
| BRQBracquegnies | 33.7 | 146 | 10:42:45.65+6.11 s | 10:42:50.19+10.65 s | 4.54 |