TOURNAI (BE)
Quarry blast23 January 2020
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 12:30:302020-01-23
- UTC
- 11:30:302020-01-23
Main parameters
| Date and time | 2020-01-23 11:30:30 UTC 2020-01-23 12:30:30 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.607° N, 3.329° E Uncertainty ± 4.5 km |
| Event ID | ROB 9180 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-01-23 13:11:44 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
- 13
- Epicentral distance
- 49.9 – 205.7km
- Mean velocity, P wave
- 4.9km/s
- Mean velocity, S wave
- 3.2km/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 1.04 s. S wave: 4 measurements, root-mean-square deviation 0.32 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)13 stations | |||||
| BOUBougnies | 49.9 | 119 | 11:30:40.86+10.30 s | – | – |
| SKQSteenkerque | 53.3 | 85 | 11:30:38.91+8.35 s | 11:30:44.84+14.28 s | 5.93 |
| BRQBracquegnies | 58.9 | 103 | 11:30:40.10+9.54 s | – | – |
| RQRRonquières | 63.4 | 90 | 11:30:40.79+10.23 s | – | – |
| ZEVZevekote | 66.3 | 333 | 11:30:41.62+11.06 s | – | – |
| OSTBOostende | 75.4 | 339 | 11:30:45.32+14.76 s | – | – |
| UCCBUccle | 75.8 | 73 | 11:30:44.09+13.53 s | 11:30:52.34+21.78 s | 8.25 |
| TGATangissart | 84.4 | 90 | 11:30:44.28+13.72 s | – | – |
| DOUDourbes | 106.6 | 122 | 11:30:51.28+20.72 s | 11:31:02.25+31.69 s | 10.97 |
| MRDMaredsous | 107.6 | 108 | 11:30:50.31+19.75 s | 11:31:01.89+31.33 s | 11.58 |
| GESGesves | 127.1 | 101 | 11:30:53.31+22.75 s | 11:31:08.82+38.26 s | 15.51 |
| CLAClavier | 141.5 | 98 | 11:30:54.70+24.14 s | – | – |
| KLBKalborn | 205.7 | 105 | 11:31:03.43+32.87 s | – | – |