RAMILLIES (BE)
Quarry blast8 January 2021
- Magnitude
- 1.7ML
- Depth
- 1.3km ± 5.4
- Belgian time
- 14:21:372021-01-08
- UTC
- 13:21:372021-01-08
Main parameters
| Date and time | 2021-01-08 13:21:37 UTC 2021-01-08 14:21:37 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.519° N, 4.973° E Uncertainty ± 2.3 km |
| Depth of hypocenter | 1.3 ± 5.4 km |
| Event ID | ROB 11815 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-01-08 15:14:49 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
- 16.9 – 93.4km
- Mean velocity, P wave
- 3.8km/s
- Mean velocity, S wave
- 2.9km/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. Hypocenter at a depth of 1.3 km. P wave: 10 measurements, root-mean-square deviation 4.14 s. S wave: 6 measurements, root-mean-square deviation 0.29 s.
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)8 stations | ||||||
| GESGesves | 16.9 | 151 | 13:21:39.34+2.03 s | 13:21:41.64+4.33 s | 2.30 | 82.5 |
| CLAClavier | 25.9 | 115 | 13:21:41.31+4.00 s | 13:21:44.91+7.60 s | 3.60 | – |
| MRDMaredsous | 28.2 | 211 | 13:21:41.67+4.36 s | 13:21:46.02+8.71 s | 4.35 | – |
| TGATangissart | 33.3 | 287 | 13:21:43.08+5.77 s | 13:21:47.29+9.98 s | 4.21 | 89.5 |
| RCHRochefort | 44.3 | 156 | 13:21:50.61+13.30 s | 13:21:50.75+13.44 s | 0.14 | – |
| DOUDourbes | 54.3 | 210 | 13:21:46.64+9.33 s | 13:21:54.43+17.12 s | 7.79 | 15.0 |
| MEMHMembach | 74.2 | 82 | 13:22:02.41+25.10 s | – | – | – |
| KLBKalborn | 93.4 | 119 | 13:21:54.39+17.08 s | – | – | – |
| Dutch seismic network (KNMI)2 stations | ||||||
| VKBValkenburg | 69.2 | 56 | 13:21:59.83+22.52 s | – | – | – |
| HGNHeimansgroeve | 73.1 | 68 | 13:21:50.21+12.90 s | – | – | – |
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