TOURNAI (BE)
Quarry blast6 April 2020
- Magnitude
- 2.2ML
- Depth
- –
- Belgian time
- 13:01:112020-04-06
- UTC
- 11:01:112020-04-06
Main parameters
| Date and time | 2020-04-06 11:01:11 UTC 2020-04-06 13:01:11 Belgian time |
|---|---|
| Magnitude | ML 2.2 |
| Epicentral coordinates | 50.662° N, 3.402° E Uncertainty ± 3.7 km |
| Event ID | ROB 9760 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-04-06 15:01:55 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
- 13
- Epicentral distance
- 31.7 – 202.5km
- Mean velocity, P wave
- 6.2km/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 0.33 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)12 stations | |||||
| LESLessines | 31.7 | 80 | 11:01:18.06+6.13 s | – | – |
| SKQSteenkerque | 48.0 | 92 | 11:01:20.07+8.14 s | 11:01:25.99+14.06 s | 5.92 |
| BRQBracquegnies | 55.8 | 111 | 11:01:21.28+9.35 s | – | – |
| RQRRonquières | 58.6 | 96 | 11:01:21.67+9.74 s | – | – |
| TGATangissart | 79.5 | 94 | 11:01:24.94+13.01 s | – | – |
| DOUDourbes | 105.8 | 126 | 11:01:29.96+18.03 s | 11:01:43.20+31.27 s | 13.24 |
| GESGesves | 123.4 | 104 | 11:01:32.63+20.70 s | 11:01:49.74+37.81 s | 17.11 |
| CLAClavier | 137.4 | 101 | 11:01:34.80+22.87 s | 11:01:53.12+41.19 s | 18.32 |
| RCHRochefort | 141.5 | 113 | 11:01:36.52+24.59 s | 11:01:53.40+41.47 s | 16.88 |
| MEMSMembach | 184.6 | 91 | 11:01:42.40+30.47 s | 11:02:03.63+51.70 s | 21.23 |
| MEMHMembach | 184.6 | 91 | 11:01:42.40+30.47 s | 11:02:03.47+51.54 s | 21.07 |
| KLBKalborn | 202.5 | 107 | 11:01:44.41+32.48 s | 11:02:07.31+55.38 s | 22.90 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 179.0 | 85 | 11:01:41.19+29.26 s | 11:02:02.71+50.78 s | 21.52 |