TOURNAI (BE)
Quarry blast16 November 2020
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 12:24:542020-11-16
- UTC
- 11:24:542020-11-16
Main parameters
| Date and time | 2020-11-16 11:24:54 UTC 2020-11-16 12:24:54 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.655° N, 3.302° E Uncertainty ± 9.2 km |
| Event ID | ROB 11320 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-11-18 08:30:58 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
- 7
- Epicentral distance
- 54.4 – 130.1km
- Mean velocity, P wave
- 5.8km/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 0.09 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)7 stations | |||||
| BOUBougnies | 54.4 | 123 | 11:25:03.86+9.42 s | – | – |
| SKQSteenkerque | 55.0 | 90 | 11:25:03.81+9.37 s | 11:25:10.14+15.70 s | 6.33 |
| BRQBracquegnies | 62.2 | 108 | 11:25:05.06+10.62 s | – | – |
| RQRRonquières | 65.5 | 94 | 11:25:05.89+11.45 s | – | – |
| DOUDourbes | 111.1 | 124 | 11:25:13.66+19.22 s | 11:25:26.78+32.34 s | 13.12 |
| MRDMaredsous | 111.2 | 110 | 11:25:13.58+19.14 s | – | – |
| GESGesves | 130.1 | 103 | 11:25:16.68+22.24 s | – | – |