ROCHEFORT (BE)
Quarry blast20 March 2019
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 13:04:332019-03-20
- UTC
- 12:04:332019-03-20
Main parameters
| Date and time | 2019-03-20 12:04:33 UTC 2019-03-20 13:04:33 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.183° N, 5.233° E Uncertainty ± 0.8 km |
| Event ID | ROB 7990 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-03-25 09:41:33 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
- 3.1 – 81.5km
- Mean velocity, P wave
- 5.6km/s
- Mean velocity, S wave
- 3.3km/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: 7 measurements, root-mean-square deviation 0.45 s. S wave: 4 measurements, root-mean-square deviation 0.12 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)6 stations | |||||
| RCHRochefort | 3.1 | 188 | 12:04:34.45+0.56 s | – | – |
| GESGesves | 24.8 | 335 | 12:04:38.48+4.59 s | 12:04:41.75+7.86 s | 3.27 |
| CLAClavier | 26.7 | 11 | 12:04:38.68+4.79 s | 12:04:42.13+8.24 s | 3.45 |
| DOUDourbes | 46.6 | 258 | 12:04:42.15+8.26 s | 12:04:48.19+14.30 s | 6.04 |
| KLBKalborn | 63.3 | 98 | 12:04:44.55+10.66 s | 12:04:53.19+19.30 s | 8.64 |
| MEMSMembach | 72.8 | 49 | 12:04:47.87+13.98 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 81.5 | 37 | 12:04:48.25+14.36 s | – | – |