LESSINES (BE)
Quarry blast14 July 2023
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 11:40:012023-07-14
- UTC
- 09:40:012023-07-14
Main parameters
| Date and time | 2023-07-14 09:40:01 UTC 2023-07-14 11:40:01 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.713° N, 3.845° E Uncertainty ± 41.9 km |
| Event ID | ROB 19930 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-07-17 08:31:18 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
- 6
- Epicentral distance
- 0.3 – 95.3km
- Mean velocity, P wave
- 5.0km/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: 6 measurements, root-mean-square deviation 0.56 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)6 stations | |||||
| LESLessines | 0.3 | 208 | 09:40:01.79−0.06 s | 09:40:01.97+0.12 s | 0.18 |
| SKQSteenkerque | 18.1 | 113 | 09:40:04.17+2.32 s | – | – |
| RQRRonquières | 29.4 | 114 | 09:40:06.06+4.21 s | 09:40:10.36+8.51 s | 4.30 |
| BRQBracquegnies | 33.0 | 141 | 09:40:07.37+5.52 s | 09:40:12.28+10.43 s | 4.91 |
| DOUDourbes | 87.0 | 142 | 09:40:18.96+17.11 s | – | – |
| GESGesves | 95.3 | 112 | 09:40:19.69+17.84 s | – | – |
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