TOURNAI (BE)
Quarry blast20 November 2020
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 13:00:292020-11-20
- UTC
- 12:00:292020-11-20
Main parameters
| Date and time | 2020-11-20 12:00:29 UTC 2020-11-20 13:00:29 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.658° N, 3.413° E Uncertainty ± 2.6 km |
| Event ID | ROB 11370 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-11-20 13:14:52 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
- 47.1 – 201.5km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.5km/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 0.16 s. S wave: 4 measurements, root-mean-square deviation 0.25 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 | |||||
| SKQSteenkerque | 47.1 | 91 | 12:00:37.74+8.39 s | 12:00:43.62+14.27 s | 5.88 |
| BOUBougnies | 48.2 | 128 | 12:00:37.95+8.60 s | 12:00:44.03+14.68 s | 6.08 |
| BRQBracquegnies | 54.9 | 111 | 12:00:38.91+9.56 s | – | – |
| RQRRonquières | 57.7 | 95 | 12:00:39.59+10.24 s | – | – |
| SNFSeneffe | 63.8 | 105 | 12:00:40.20+10.85 s | – | – |
| MRDMaredsous | 104.0 | 112 | 12:00:46.83+17.48 s | 12:01:00.39+31.04 s | 13.56 |
| DOUDourbes | 104.8 | 126 | 12:00:47.41+18.06 s | 12:00:59.95+30.60 s | 12.54 |
| GESGesves | 122.5 | 104 | 12:00:49.56+20.21 s | 12:01:05.42+36.07 s | 15.86 |
| RCHRochefort | 140.6 | 113 | 12:00:52.79+23.44 s | 12:01:10.90+41.55 s | 18.11 |
| KLBKalborn | 201.5 | 107 | 12:01:02.03+32.68 s | 12:01:24.96+55.61 s | 22.93 |