TOURNAI (BE)
Quarry blast3 January 2020
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 13:00:552020-01-03
- UTC
- 12:00:552020-01-03
Main parameters
| Date and time | 2020-01-03 12:00:55 UTC 2020-01-03 13:00:55 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.635° N, 3.308° E Uncertainty ± 4.0 km |
| Event ID | ROB 9065 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-01-03 13:19:02 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
- 14
- Epicentral distance
- 38.7 – 172.2km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.4km/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: 10 measurements, root-mean-square deviation 0.38 s. S wave: 6 measurements, root-mean-square deviation 0.35 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)14 stations | |||||
| LESLessines | 38.7 | 77 | 12:01:02.57+7.16 s | 12:01:06.41+11.00 s | 3.84 |
| SKQSteenkerque | 54.6 | 88 | 12:01:04.70+9.29 s | 12:01:10.60+15.19 s | 5.90 |
| BRQBracquegnies | 61.1 | 106 | 12:01:05.84+10.43 s | – | – |
| ZEVZevekote | 62.8 | 333 | 12:01:06.99+11.58 s | 12:01:13.30+17.89 s | 6.31 |
| RQRRonquières | 65.0 | 93 | 12:01:06.27+10.86 s | – | – |
| OSTBOostende | 71.9 | 339 | 12:01:07.52+12.11 s | – | – |
| UCCSUccle | 76.4 | 76 | 12:01:08.63+13.22 s | – | – |
| UCCBUccle | 76.4 | 76 | 12:01:08.74+13.33 s | 12:01:17.73+22.32 s | 8.99 |
| TGATangissart | 86.0 | 92 | 12:01:09.71+14.30 s | 12:01:20.77+25.36 s | 11.06 |
| DOUDourbes | 109.5 | 123 | 12:01:14.12+18.71 s | 12:01:27.46+32.05 s | 13.34 |
| GESGesves | 129.2 | 102 | 12:01:16.56+21.15 s | – | – |
| CLAClavier | 143.4 | 99 | 12:01:19.16+23.75 s | – | – |
| RCHRochefort | 146.5 | 111 | 12:01:20.37+24.96 s | – | – |
| OPTBOpitter | 172.2 | 71 | 12:01:23.11+27.70 s | – | – |