NAMUR (BE)
Quarry blast12 July 2018
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:51:102018-07-12
- UTC
- 11:51:102018-07-12
Main parameters
| Date and time | 2018-07-12 11:51:10 UTC 2018-07-12 13:51:10 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.502° N, 4.946° E Uncertainty ± 2.1 km |
| Event ID | ROB 6955 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-07-12 14:00:20 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
- 16.4 – 94.2km
- 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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 9 measurements, root-mean-square deviation 0.46 s.
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)9 stations | |||||
| GESGesves | 16.4 | 142 | 11:51:14.29+3.41 s | – | – |
| MRDMaredsous | 25.6 | 210 | 11:51:15.75+4.87 s | – | – |
| CLAClavier | 26.9 | 110 | 11:51:15.07+4.19 s | 11:51:17.15+6.27 s | 2.08 |
| LCHLa Chartreuse | 48.7 | 72 | 11:51:20.38+9.50 s | – | – |
| DOUDourbes | 51.7 | 209 | 11:51:20.01+9.13 s | 11:51:26.99+16.11 s | 6.98 |
| SKQSteenkerque | 63.5 | 285 | 11:51:21.67+10.79 s | – | – |
| HOUHouvegnez | 77.1 | 102 | 11:51:23.84+12.96 s | – | – |
| MRGMont Rigi | 80.1 | 89 | 11:51:24.12+13.24 s | – | – |
| KLBKalborn | 94.2 | 118 | 11:51:27.06+16.18 s | – | – |
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