NORTH SEA
Controlled explosion4 March 2020
- Magnitude
- 2.4ML
- Depth
- –
- Belgian time
- 07:40:092020-03-04
- UTC
- 06:40:092020-03-04
Main parameters
| Date and time | 2020-03-04 06:40:09 UTC 2020-03-04 07:40:09 Belgian time |
|---|---|
| Magnitude | ML 2.4 |
| Epicentral coordinates | 51.493° N, 3.226° E Uncertainty ± 3.0 km |
| Event ID | ROB 9365 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-03-04 07:48:55 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
- 18
- Epicentral distance
- 34.7 – 232.9km
- 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: 5 measurements, root-mean-square deviation 0.14 s. S wave: 4 measurements, root-mean-square deviation 0.20 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)17 stations | |||||
| OSTBOostende | 34.7 | 215 | 06:40:14.91+5.52 s | 06:40:18.95+9.56 s | 4.04 |
| ZEVZevekote | 45.7 | 210 | 06:40:16.97+7.58 s | 06:40:22.23+12.84 s | 5.26 |
| LESLessines | 97.2 | 153 | 06:40:25.97+16.58 s | 06:40:37.77+28.38 s | 11.80 |
| UCCBUccle | 110.9 | 134 | 06:40:27.99+18.60 s | – | – |
| SKQSteenkerque | 111.4 | 147 | 06:40:28.12+18.73 s | 06:40:41.45+32.06 s | 13.33 |
| RQRRonquières | 121.1 | 144 | 06:40:29.84+20.45 s | – | – |
| BRQBracquegnies | 129.5 | 150 | 06:40:31.40+22.01 s | – | – |
| DSLBDessel | 131.4 | 102 | 06:40:31.41+22.02 s | – | – |
| BOUBougnies | 132.9 | 157 | 06:40:31.92+22.53 s | – | – |
| MOLTMol | 133.3 | 103 | 06:40:32.16+22.77 s | – | – |
| TGATangissart | 134.3 | 137 | 06:40:32.12+22.73 s | – | – |
| MRDMaredsous | 171.3 | 140 | 06:40:38.09+28.70 s | 06:40:58.13+48.74 s | 20.04 |
| GESGesves | 179.8 | 133 | 06:40:37.96+28.57 s | 06:41:00.47+51.08 s | 22.51 |
| DOUDourbes | 183.1 | 148 | 06:40:39.43+30.04 s | – | – |
| CLAClavier | 188.6 | 129 | 06:40:39.22+29.83 s | – | – |
| RCHRochefort | 205.1 | 136 | 06:40:42.56+33.17 s | – | – |
| HOUHouvegnez | 232.9 | 122 | 06:40:44.94+35.55 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 206.1 | 112 | 06:40:42.81+33.42 s | – | – |