LESSINES (BE)
Quarry blast20 June 2018
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 12:39:352018-06-20
- UTC
- 10:39:352018-06-20
Main parameters
| Date and time | 2018-06-20 10:39:35 UTC 2018-06-20 12:39:35 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.719° N, 3.863° E Uncertainty ± 9.6 km |
| Event ID | ROB 6805 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-06-20 12:56:54 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
- 1.7 – 94.3km
- Mean velocity, P wave
- 5.7km/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 0.28 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 | 1.7 | 239 | 10:39:35.36+0.36 s | 10:39:35.54+0.54 s | 0.18 |
| SKQSteenkerque | 17.2 | 117 | 10:39:38.10+3.10 s | 10:39:40.56+5.56 s | 2.46 |
| RQRRonquières | 28.5 | 116 | 10:39:39.89+4.89 s | – | – |
| BRQBracquegnies | 32.7 | 144 | 10:39:41.19+6.19 s | – | – |
| DOUDourbes | 86.7 | 143 | 10:39:49.86+14.86 s | – | – |
| GESGesves | 94.3 | 113 | 10:39:51.96+16.96 s | – | – |
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