TOURNAI (BE)
Quarry blast26 October 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:00:352020-10-26
- UTC
- 12:00:352020-10-26
Main parameters
| Date and time | 2020-10-26 12:00:35 UTC 2020-10-26 13:00:35 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.621° N, 3.423° E Uncertainty ± 23.4 km |
| Event ID | ROB 11155 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-10-26 14:46:34 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
- 6
- Epicentral distance
- 31.4 – 69.1km
- Mean velocity, P wave
- 6.6km/s
- Mean velocity, S wave
- 3.6km/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 0.18 s. S wave: 4 measurements, root-mean-square deviation 0.06 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 | |||||
| LESLessines | 31.4 | 71 | 12:00:42.05+6.09 s | 12:00:45.89+9.93 s | 3.84 |
| SKQSteenkerque | 46.6 | 86 | 12:00:44.17+8.21 s | 12:00:50.21+14.25 s | 6.04 |
| BRQBracquegnies | 52.9 | 107 | 12:00:45.46+9.50 s | – | – |
| RQRRonquières | 56.8 | 91 | 12:00:45.49+9.53 s | 12:00:53.07+17.11 s | 7.58 |
| SNFSeneffe | 62.2 | 101 | 12:00:46.64+10.68 s | – | – |
| UCCBUccle | 69.1 | 73 | 12:00:47.78+11.82 s | 12:00:56.34+20.38 s | 8.56 |