MOURCOURT (BE)
Quarry blast26 July 2018
- Magnitude
- 1.7ML
- Depth
- 9.9km ± 3.3
- Belgian time
- 13:00:252018-07-26
- UTC
- 11:00:252018-07-26
Main parameters
| Date and time | 2018-07-26 11:00:25 UTC 2018-07-26 13:00:25 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.654° N, 3.462° E Uncertainty ± 2.6 km |
| Depth of hypocenter | 9.9 ± 3.3 km |
| Event ID | ROB 7035 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-07-27 10:56:33 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
- 7
- Epicentral distance
- 27.7 – 133.1km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.4km/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 9.9 km. P wave: 6 measurements, root-mean-square deviation 0.21 s. S wave: 5 measurements, root-mean-square deviation 0.36 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)7 stations | ||||||
| LESLessines | 27.7 | 77 | 11:00:30.86+5.18 s | 11:00:34.76+9.08 s | 3.90 | – |
| SKQSteenkerque | 43.7 | 90 | 11:00:33.02+7.34 s | 11:00:38.24+12.56 s | 5.22 | – |
| BOUBougnies | 45.2 | 130 | 11:00:33.20+7.52 s | 11:00:39.56+13.88 s | 6.36 | – |
| BRQBracquegnies | 51.5 | 112 | 11:00:34.22+8.54 s | 11:00:40.85+15.17 s | 6.63 | – |
| RQRRonquières | 54.3 | 95 | 11:00:34.70+9.02 s | – | – | – |
| DOUDourbes | 101.8 | 127 | 11:00:42.94+17.26 s | 11:00:55.40+29.72 s | 12.46 | – |
| CLAClavier | 133.1 | 101 | 11:00:48.13+22.45 s | 11:01:03.94+38.26 s | 15.81 | 11.1 |