TOURNAI (BE)
Quarry blast13 January 2020
- Magnitude
- 1.6ML
- Depth
- 7.8km ± 3.4
- Belgian time
- 12:30:452020-01-13
- UTC
- 11:30:452020-01-13
Main parameters
| Date and time | 2020-01-13 11:30:45 UTC 2020-01-13 12:30:45 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.699° N, 3.423° E Uncertainty ± 3.5 km |
| Depth of hypocenter | 7.8 ± 3.4 km |
| Event ID | ROB 9110 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-01-13 13:11:03 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
- 15
- Epicentral distance
- 29.7 – 215.4km
- Mean velocity, P wave
- 6.2km/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. Hypocenter at a depth of 7.8 km. P wave: 9 measurements, root-mean-square deviation 0.39 s. S wave: 6 measurements, root-mean-square deviation 0.57 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 | nm | |
|---|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)15 stations | ||||||
| LESLessines | 29.7 | 87 | 11:30:51.49+5.76 s | 11:30:55.48+9.75 s | 3.99 | 38.3 |
| SKQSteenkerque | 46.8 | 97 | 11:30:53.66+7.93 s | 11:30:59.00+13.27 s | 5.34 | – |
| BOUBougnies | 50.5 | 133 | 11:30:54.23+8.50 s | – | – | – |
| BRQBracquegnies | 56.0 | 115 | 11:30:54.91+9.18 s | – | – | – |
| RQRRonquières | 57.6 | 100 | 11:30:55.03+9.30 s | – | – | – |
| UCCBUccle | 67.0 | 80 | 11:30:57.75+12.02 s | 11:31:05.20+19.47 s | 7.45 | – |
| TGATangissart | 78.4 | 97 | 11:30:58.45+12.72 s | 11:31:07.92+22.19 s | 9.47 | – |
| MRDMaredsous | 105.1 | 114 | 11:31:03.43+17.70 s | 11:31:17.06+31.33 s | 13.63 | – |
| DOUDourbes | 107.0 | 128 | 11:31:03.25+17.52 s | 11:31:16.84+31.11 s | 13.59 | – |
| CLAClavier | 136.7 | 102 | 11:31:08.65+22.92 s | 11:31:26.35+40.62 s | 17.70 | – |
| RCHRochefort | 141.7 | 115 | 11:31:09.49+23.76 s | 11:31:26.38+40.65 s | 16.89 | – |
| MEMHMembach | 183.2 | 92 | 11:31:17.59+31.86 s | 11:31:35.69+49.96 s | 18.10 | – |
| HOUHouvegnez | 187.0 | 101 | 11:31:17.10+31.37 s | – | – | – |
| KLBKalborn | 202.2 | 108 | 11:31:17.28+31.55 s | 11:31:40.66+54.93 s | 23.38 | – |
| VIAVianden | 215.4 | 112 | 11:31:19.21+33.48 s | 11:31:43.19+57.46 s | 23.98 | – |