TOURNAI (BE)
Quarry blast16 October 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 12:59:592020-10-16
- UTC
- 10:59:592020-10-16
Main parameters
| Date and time | 2020-10-16 10:59:59 UTC 2020-10-16 12:59:59 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.651° N, 3.509° E Uncertainty ± 5.8 km |
| Event ID | ROB 11110 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-10-16 13:26:39 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
- 10
- Epicentral distance
- 24.5 – 194.8km
- Mean velocity, P wave
- 6.3km/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 0.19 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)10 stations | |||||
| LESLessines | 24.5 | 74 | 11:00:04.73+5.09 s | – | – |
| SKQSteenkerque | 40.4 | 90 | 11:00:06.85+7.21 s | 11:00:11.26+11.62 s | 4.41 |
| BOUBougnies | 42.4 | 133 | 11:00:06.94+7.30 s | – | – |
| BRQBracquegnies | 48.2 | 113 | 11:00:08.08+8.44 s | – | – |
| RQRRonquières | 50.9 | 95 | 11:00:08.63+8.99 s | – | – |
| MRDMaredsous | 97.4 | 113 | 11:00:16.11+16.47 s | 11:00:32.27+32.63 s | 16.16 |
| DOUDourbes | 98.9 | 128 | 11:00:16.11+16.47 s | 11:00:29.75+30.11 s | 13.64 |
| CLAClavier | 129.7 | 101 | 11:00:21.33+21.69 s | 11:00:39.28+39.64 s | 17.95 |
| RCHRochefort | 134.0 | 114 | 11:00:22.28+22.64 s | 11:00:38.56+38.92 s | 16.28 |
| KLBKalborn | 194.8 | 107 | 11:00:31.24+31.60 s | 11:00:53.33+53.69 s | 22.09 |