HAVINNES (BE)
Quarry blast11 July 2017
- Magnitude
- 1.8ML
- Depth
- 11.5km ± 3.2
- Belgian time
- 13:00:552017-07-11
- UTC
- 11:00:552017-07-11
Main parameters
| Date and time | 2017-07-11 11:00:55 UTC 2017-07-11 13:00:55 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.637° N, 3.461° E Uncertainty ± 3.3 km |
| Depth of hypocenter | 11.5 ± 3.2 km |
| Event ID | ROB 5765 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2017-07-11 13:36:29 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
- 28.2 – 183.2km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.5km/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 11.5 km. P wave: 9 measurements, root-mean-square deviation 0.36 s. S wave: 6 measurements, root-mean-square deviation 0.56 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)12 stations | ||||||
| LESLessines | 28.2 | 73 | 11:01:00.89+5.52 s | 11:01:04.76+9.39 s | 3.87 | – |
| SKQSteenkerque | 43.8 | 88 | 11:01:03.07+7.70 s | 11:01:07.95+12.58 s | 4.88 | – |
| BOUBougnies | 44.0 | 129 | 11:01:03.44+8.07 s | – | – | – |
| BRQBracquegnies | 50.9 | 110 | 11:01:04.40+9.03 s | – | – | – |
| RQRRonquières | 54.2 | 93 | 11:01:04.60+9.23 s | – | – | – |
| SNFSeneffe | 60.0 | 103 | 11:01:05.33+9.96 s | 11:01:12.59+17.22 s | 7.26 | – |
| MRDMaredsous | 100.0 | 111 | 11:01:12.35+16.98 s | 11:01:24.35+28.98 s | 12.00 | – |
| DOUDourbes | 100.7 | 126 | 11:01:11.33+15.96 s | 11:01:24.85+29.48 s | 13.52 | – |
| GESGesves | 118.7 | 103 | 11:01:15.05+19.68 s | 11:01:30.87+35.50 s | 15.82 | – |
| DSLBDessel | 130.8 | 59 | 11:01:16.40+21.03 s | 11:01:33.33+37.96 s | 16.93 | – |
| CLAClavier | 132.8 | 100 | 11:01:16.03+20.66 s | 11:01:31.11+35.74 s | 15.08 | 13.2 |
| HOUHouvegnez | 183.2 | 99 | 11:01:24.35+28.98 s | 11:01:42.95+47.58 s | 18.60 | – |