TOURNAI (BE)
Quarry blast2 April 2020
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 13:01:432020-04-02
- UTC
- 11:01:432020-04-02
Main parameters
| Date and time | 2020-04-02 11:01:43 UTC 2020-04-02 13:01:43 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.612° N, 3.488° E Uncertainty ± 5.4 km |
| Event ID | ROB 9710 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-04-02 13:26:43 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
- 40.8 – 195.0km
- Mean velocity, P wave
- 5.9km/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 0.14 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 | |||||
| BOUBougnies | 40.8 | 127 | 11:01:50.30+7.05 s | – | – |
| SKQSteenkerque | 42.1 | 84 | 11:01:50.18+6.93 s | – | – |
| BRQBracquegnies | 48.2 | 107 | 11:01:51.28+8.03 s | – | – |
| RQRRonquières | 52.2 | 90 | 11:01:51.91+8.66 s | – | – |
| UCCBUccle | 64.9 | 71 | 11:01:54.46+11.21 s | 11:02:02.28+19.03 s | 7.82 |
| DOUDourbes | 97.5 | 126 | 11:01:59.78+16.53 s | – | – |
| GESGesves | 116.2 | 102 | 11:02:02.90+19.65 s | – | – |
| CLAClavier | 130.4 | 99 | 11:02:04.95+21.70 s | – | – |
| RCHRochefort | 133.7 | 112 | 11:02:05.67+22.42 s | 11:02:22.61+39.36 s | 16.94 |
| KLBKalborn | 195.0 | 106 | 11:02:14.62+31.37 s | – | – |