The Netherlands
Controlled explosion23 August 2018
- Magnitude
- 2.4ML
- Depth
- –
- Belgian time
- 07:53:082018-08-23
- UTC
- 05:53:082018-08-23
Main parameters
| Date and time | 2018-08-23 05:53:08 UTC 2018-08-23 07:53:08 Belgian time |
|---|---|
| Magnitude | ML 2.4 |
| Epicentral coordinates | 51.474° N, 3.501° E Uncertainty ± 3.9 km |
| Event ID | ROB 7135 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2018-08-23 10:21:40 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
- 56.3 – 368.1km
- Mean velocity, P wave
- 5.7km/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 0.38 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 | |||||
| ZEVZevekote | 56.3 | 228 | 05:53:17.53+9.43 s | – | – |
| LESLessines | 88.3 | 164 | 05:53:23.72+15.62 s | – | – |
| UCCSUccle | 96.4 | 141 | 05:53:24.65+16.55 s | – | – |
| SKQSteenkerque | 100.4 | 156 | 05:53:25.33+17.23 s | 05:53:36.58+28.48 s | 11.25 |
| RQRRonquières | 109.1 | 152 | 05:53:26.48+18.38 s | – | – |
| MOLTMol | 114.2 | 104 | 05:53:28.50+20.40 s | – | – |
| BRQBracquegnies | 119.2 | 158 | 05:53:28.37+20.27 s | – | – |
| BOUBougnies | 124.7 | 165 | 05:53:29.71+21.61 s | – | – |
| MRDMaredsous | 158.0 | 145 | 05:53:34.29+26.19 s | 05:53:53.79+45.69 s | 19.50 |
| DOUDourbes | 171.8 | 153 | 05:53:36.48+28.38 s | – | – |
| CLAClavier | 172.6 | 132 | 05:53:36.13+28.03 s | – | – |
| MEMSMembach | 200.6 | 118 | 05:53:39.87+31.77 s | – | – |
| KLBKalborn | 239.1 | 129 | 05:53:44.32+36.22 s | – | – |
| British Geological Survey (United Kingdom)1 station | |||||
| SWN1Swindon | 368.1 | 273 | 05:54:01.01+52.91 s | – | – |