REBECQ (BE)
Quarry blast16 July 2020
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 13:00:322020-07-16
- UTC
- 11:00:322020-07-16
Main parameters
| Date and time | 2020-07-16 11:00:32 UTC 2020-07-16 13:00:32 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.676° N, 4.142° E Uncertainty ± 1.1 km |
| Event ID | ROB 10495 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-07-16 14:23:06 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
- 9
- Epicentral distance
- 5.3 – 132.3km
- Mean velocity, P wave
- 5.7km/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: 6 measurements, root-mean-square deviation 0.17 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 | |||||
| SKQSteenkerque | 5.3 | 236 | 11:00:33.47+1.09 s | 11:00:34.22+1.84 s | 0.75 |
| RQRRonquières | 9.7 | 143 | 11:00:33.80+1.42 s | – | – |
| UCCBUccle | 20.4 | 49 | 11:00:36.14+3.76 s | – | – |
| BRQBracquegnies | 21.7 | 181 | 11:00:36.19+3.81 s | – | – |
| DOUDourbes | 72.2 | 153 | 11:00:45.11+12.73 s | – | – |
| CLAClavier | 87.0 | 109 | 11:00:47.43+15.05 s | 11:00:58.07+25.69 s | 10.64 |
| MEMSMembach | 132.3 | 92 | 11:00:55.28+22.90 s | – | – |
| MEMHMembach | 132.3 | 92 | 11:00:55.31+22.93 s | 11:01:11.16+38.78 s | 15.85 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 126.8 | 85 | 11:00:54.10+21.72 s | – | – |