OBIGIES (BE)
Quarry blast16 October 2018
- Magnitude
- 1.4ML
- Depth
- 3.3km ± 4.5
- Belgian time
- 12:34:522018-10-16
- UTC
- 10:34:522018-10-16
Main parameters
| Date and time | 2018-10-16 10:34:52 UTC 2018-10-16 12:34:52 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.661° N, 3.366° E Uncertainty ± 2.4 km |
| Depth of hypocenter | 3.3 ± 4.5 km |
| Event ID | ROB 7265 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-10-16 13:34:23 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
- 10
- Epicentral distance
- 50.5 – 204.8km
- Mean velocity, P wave
- 6.1km/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 3.3 km. P wave: 6 measurements, root-mean-square deviation 0.12 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)10 stations | ||||||
| SKQSteenkerque | 50.5 | 91 | 10:35:01.04+8.80 s | 10:35:07.06+14.82 s | 6.02 | – |
| BOUBougnies | 51.0 | 126 | 10:35:01.21+8.97 s | 10:35:06.97+14.73 s | 5.76 | – |
| BRQBracquegnies | 58.1 | 110 | 10:35:02.11+9.87 s | – | – | – |
| RQRRonquières | 61.1 | 95 | 10:35:02.57+10.33 s | – | – | – |
| MRDMaredsous | 107.2 | 111 | 10:35:10.23+17.99 s | – | – | – |
| DOUDourbes | 107.8 | 125 | 10:35:10.53+18.29 s | 10:35:23.68+31.44 s | 13.15 | – |
| GESGesves | 125.8 | 103 | 10:35:13.23+20.99 s | – | – | – |
| CLAClavier | 139.8 | 100 | 10:35:15.61+23.37 s | 10:35:33.06+40.82 s | 17.45 | 4.5 |
| MEMHMembach | 187.1 | 91 | 10:35:22.54+30.30 s | – | – | – |
| KLBKalborn | 204.8 | 107 | 10:35:25.39+33.15 s | – | – | – |