LESSINES (BE)
Quarry blast3 March 2021
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 12:43:522021-03-03
- UTC
- 11:43:522021-03-03
Main parameters
| Date and time | 2021-03-03 11:43:52 UTC 2021-03-03 12:43:52 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.713° N, 3.845° E Uncertainty ± 34.8 km |
| Event ID | ROB 12635 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-03-03 16:09:14 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
- 0.3 – 95.3km
- Mean velocity, P wave
- 5.1km/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 0.31 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 | |||||
| LESLessines | 0.3 | 208 | 11:43:51.82−0.18 s | 11:43:52.03+0.03 s | 0.21 |
| SKQSteenkerque | 18.1 | 113 | 11:43:54.55+2.55 s | 11:43:56.94+4.94 s | 2.39 |
| RQRRonquières | 29.4 | 114 | 11:43:56.79+4.79 s | – | – |
| BRQBracquegnies | 33.0 | 141 | 11:43:57.81+5.81 s | – | – |
| SNFSeneffe | 38.4 | 126 | 11:43:58.23+6.23 s | – | – |
| DOUDourbes | 87.0 | 142 | 11:44:08.38+16.38 s | – | – |
| GESGesves | 95.3 | 112 | 11:44:09.92+17.92 s | 11:44:20.94+28.94 s | 11.02 |
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