HORRUES (BE)
Quarry blast7 April 2017
- Magnitude
- 1.9ML
- Depth
- 7.8km ± 2.4
- Belgian time
- 14:01:422017-04-07
- UTC
- 12:01:422017-04-07
Main parameters
| Date and time | 2017-04-07 12:01:42 UTC 2017-04-07 14:01:42 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.603° N, 4.029° E Uncertainty ± 2.2 km |
| Depth of hypocenter | 7.8 ± 2.4 km |
| Event ID | ROB 5668 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-04-07 14:21:37 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
- 6.3 – 140.3km
- 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. Hypocenter at a depth of 7.8 km. P wave: 8 measurements, root-mean-square deviation 0.34 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 | ||||||
| SKQSteenkerque | 6.3 | 35 | 12:01:43.91+1.83 s | 12:01:45.27+3.19 s | 1.36 | – |
| RQRRonquières | 13.9 | 88 | 12:01:44.58+2.50 s | – | – | – |
| BRQBracquegnies | 15.5 | 151 | 12:01:44.63+2.55 s | – | – | – |
| LESLessines | 17.8 | 313 | 12:01:45.93+3.85 s | – | – | – |
| SNFSeneffe | 20.8 | 119 | 12:01:45.43+3.35 s | – | – | – |
| BOUBougnies | 24.5 | 194 | 12:01:46.08+4.00 s | – | – | – |
| MRDMaredsous | 62.3 | 122 | 12:01:52.61+10.53 s | 12:02:00.50+18.42 s | 7.89 | – |
| DOUDourbes | 69.4 | 144 | 12:01:54.36+12.28 s | 12:02:02.84+20.76 s | 8.48 | 29.2 |
| MEMHMembach | 140.3 | 89 | 12:02:05.24+23.16 s | – | – | – |