COUVIN (BE)
Quarry blast5 July 2018
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 12:50:252018-07-05
- UTC
- 10:50:252018-07-05
Main parameters
| Date and time | 2018-07-05 10:50:25 UTC 2018-07-05 12:50:25 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 49.976° N, 4.530° E Uncertainty ± 4.8 km |
| Event ID | ROB 6890 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-07-11 11:02:06 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
- 8
- Epicentral distance
- 14.0 – 126.8km
- Mean velocity, P wave
- 5.5km/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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 5 measurements, root-mean-square deviation 0.69 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)8 stations | |||||
| DOUDourbes | 14.0 | 19 | 10:50:27.21+1.42 s | 10:50:28.86+3.07 s | 1.65 |
| CLAClavier | 73.9 | 48 | 10:50:38.19+12.40 s | 10:50:48.04+22.25 s | 9.85 |
| SKQSteenkerque | 81.4 | 337 | 10:50:41.04+15.25 s | – | – |
| LCHLa Chartreuse | 106.0 | 46 | 10:50:43.99+18.20 s | – | – |
| KLBKalborn | 113.9 | 82 | 10:50:44.92+19.13 s | – | – |
| VIAVianden | 120.1 | 92 | 10:50:46.78+20.99 s | – | – |
| WLFWalferdange | 121.7 | 106 | 10:50:47.26+21.47 s | – | – |
| MEMSMembach | 126.8 | 56 | 10:50:46.80+21.01 s | – | – |