LESSINES (BE)
Quarry blast19 September 2017
- Magnitude
- 1.2ML
- Depth
- 2.4km ± 4.7
- Belgian time
- 14:48:252017-09-19
- UTC
- 12:48:252017-09-19
Main parameters
| Date and time | 2017-09-19 12:48:25 UTC 2017-09-19 14:48:25 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.713° N, 3.838° E Uncertainty ± 4.7 km |
| Depth of hypocenter | 2.4 ± 4.7 km |
| Event ID | ROB 5895 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-09-20 12:50:12 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
- 9
- Epicentral distance
- 0.4 – 154.0km
- Mean velocity, P wave
- 5.6km/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. Hypocenter at a depth of 2.4 km. P wave: 8 measurements, root-mean-square deviation 0.23 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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 | nm | |
|---|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)9 stations | ||||||
| LESLessines | 0.4 | 123 | 12:48:25.56+0.19 s | – | – | – |
| SKQSteenkerque | 18.6 | 113 | 12:48:28.30+2.93 s | 12:48:30.44+5.07 s | 2.14 | – |
| RQRRonquières | 29.9 | 113 | 12:48:30.12+4.75 s | – | – | – |
| BRQBracquegnies | 33.4 | 141 | 12:48:31.19+5.82 s | – | – | – |
| BOUBougnies | 36.9 | 168 | 12:48:31.55+6.18 s | – | – | – |
| DOUDourbes | 87.3 | 142 | 12:48:40.96+15.59 s | 12:48:51.57+26.20 s | 10.61 | – |
| DSLBDessel | 103.7 | 56 | 12:48:43.53+18.16 s | – | – | – |
| CLAClavier | 108.8 | 107 | 12:48:43.99+18.62 s | 12:48:59.71+34.34 s | 15.72 | 4.0 |
| MEMHMembach | 154.0 | 93 | 12:48:48.86+23.49 s | – | – | – |