LESSINES (BE)
Quarry blast16 July 2019
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 12:40:162019-07-16
- UTC
- 10:40:162019-07-16
Main parameters
| Date and time | 2019-07-16 10:40:16 UTC 2019-07-16 12:40:16 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.728° N, 3.867° E Uncertainty ± 2.0 km |
| Event ID | ROB 8380 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-07-16 12:52:05 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
- 12
- Epicentral distance
- 2.5 – 174.0km
- Mean velocity, P wave
- 5.7km/s
- Mean velocity, S wave
- 3.3km/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: 9 measurements, root-mean-square deviation 0.24 s. S wave: 4 measurements, root-mean-square deviation 0.27 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 | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)12 stations | |||||
| LESLessines | 2.5 | 223 | 10:40:16.20+0.19 s | – | – |
| SKQSteenkerque | 17.4 | 120 | 10:40:18.83+2.82 s | 10:40:21.06+5.05 s | 2.23 |
| RQRRonquières | 28.7 | 118 | 10:40:20.44+4.43 s | – | – |
| UCCBUccle | 35.6 | 77 | 10:40:22.43+6.42 s | 10:40:27.05+11.04 s | 4.62 |
| BOUBougnies | 38.1 | 172 | 10:40:22.83+6.82 s | – | – |
| MRDMaredsous | 79.5 | 126 | 10:40:29.86+13.85 s | – | – |
| DOUDourbes | 87.4 | 143 | 10:40:31.59+15.58 s | 10:40:42.18+26.17 s | 10.59 |
| GESGesves | 94.5 | 113 | 10:40:32.45+16.44 s | 10:40:44.01+28.00 s | 11.56 |
| RCHRochefort | 115.7 | 123 | 10:40:36.15+20.14 s | – | – |
| MEMHMembach | 152.1 | 94 | 10:40:41.71+25.70 s | 10:41:00.77+44.76 s | 19.06 |
| MEMSMembach | 152.1 | 94 | 10:40:41.71+25.70 s | – | – |
| KLBKalborn | 174.0 | 113 | 10:40:44.68+28.67 s | 10:41:05.33+49.32 s | 20.65 |