TOURNAI (BE)
Quarry blast17 July 2020
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:59:522020-07-17
- UTC
- 10:59:522020-07-17
Main parameters
| Date and time | 2020-07-17 10:59:52 UTC 2020-07-17 12:59:52 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.667° N, 3.396° E Uncertainty ± 4.5 km |
| Event ID | ROB 10505 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-07-17 16:06:57 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
- 8
- Epicentral distance
- 32.0 – 203.0km
- 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 0.23 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 | |||||
| LESLessines | 32.0 | 81 | 10:59:59.13+6.27 s | 11:00:03.04+10.18 s | 3.91 |
| SKQSteenkerque | 48.4 | 92 | 11:00:01.09+8.23 s | 11:00:07.11+14.25 s | 6.02 |
| BOUBougnies | 49.7 | 128 | 11:00:01.56+8.70 s | – | – |
| BRQBracquegnies | 56.3 | 111 | 11:00:02.49+9.63 s | – | – |
| RQRRonquières | 59.0 | 96 | 11:00:02.96+10.10 s | – | – |
| DOUDourbes | 106.4 | 126 | 11:00:10.87+18.01 s | 11:00:24.74+31.88 s | 13.87 |
| RCHRochefort | 142.0 | 113 | 11:00:16.72+23.86 s | 11:00:34.92+42.06 s | 18.20 |
| KLBKalborn | 203.0 | 107 | 11:00:25.73+32.87 s | 11:00:47.94+55.08 s | 22.21 |