LESSINES (BE)
Quarry blast30 August 2019
- Magnitude
- 1.5ML
- Depth
- 2.4km ± 4.5
- Belgian time
- 11:41:042019-08-30
- UTC
- 09:41:042019-08-30
Main parameters
| Date and time | 2019-08-30 09:41:04 UTC 2019-08-30 11:41:04 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.696° N, 3.920° E Uncertainty ± 4.7 km |
| Depth of hypocenter | 2.4 ± 4.5 km |
| Event ID | ROB 8595 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-08-30 12:54:51 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
- 11
- Epicentral distance
- 12.5 – 169.2km
- 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. Hypocenter at a depth of 2.4 km. P wave: 8 measurements, root-mean-square deviation 0.40 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)11 stations | ||||||
| SKQSteenkerque | 12.5 | 115 | 09:41:06.14+1.86 s | 09:41:08.33+4.05 s | 2.19 | – |
| RQRRonquières | 23.8 | 115 | 09:41:07.89+3.61 s | 09:41:11.39+7.11 s | 3.50 | – |
| BRQBracquegnies | 28.4 | 147 | 09:41:08.93+4.65 s | – | – | – |
| BOUBougnies | 34.2 | 177 | 09:41:10.34+6.06 s | – | – | – |
| DOUDourbes | 82.3 | 144 | 09:41:18.86+14.58 s | – | – | – |
| GESGesves | 89.7 | 112 | 09:41:19.91+15.63 s | – | – | – |
| CLAClavier | 102.7 | 107 | 09:41:22.59+18.31 s | – | – | – |
| RCHRochefort | 110.7 | 122 | 09:41:22.67+18.39 s | – | – | – |
| MEMSMembach | 148.1 | 93 | 09:41:29.13+24.85 s | – | – | – |
| HOUHouvegnez | 152.7 | 104 | 09:41:29.69+25.41 s | – | – | – |
| KLBKalborn | 169.2 | 112 | 09:41:32.02+27.74 s | 09:41:52.45+48.17 s | 20.43 | 4.9 |