SW of PRUM (DE)
Earthquake3 September 1986
- Magnitude
- 1.9ML
- Depth
- 13.5km ± 8.0
- Belgian time
- 03:54:251986-09-03
- UTC
- 01:54:251986-09-03
Main parameters
| Date and time | 1986-09-03 01:54:25 UTC 1986-09-03 03:54:25 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.123° N, 6.269° E Uncertainty ± 1.7 km |
| Depth of hypocenter | 13.5 ± 8.0 km |
| Event ID | ROB 698 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2009-05-30 18:17:43 Belgian time
Location map
- Epicentre
- Station that recorded the event
Seismic activity in the area
Known earthquakes around the epicentre, from the catalogue of the Royal Observatory of Belgium.
Within 10 km of the epicentre
3 other earthquakes in the catalogue since 1978. 2 of them occurred after this one. By magnitude, it is the 3rd largest of the 4 earthquakes of known magnitude in the area.
Latest earthquakes before this one
| Date | Place | Magnitude | Intensity | Distance km |
|---|---|---|---|---|
| 1978-10-07 | PRUM | ML 2.6 | – | 7.7 |
Largest known earthquakes
| Date | Place | Magnitude | Intensity | Distance km |
|---|---|---|---|---|
| 1978-10-07 | PRUM | ML 2.6 | – | 7.7 |
| 2026-10-13 | HECKHUSCHEID (DE) | ML 2.4 | – | 8.0 |
| 1986-09-03 | This earthquake | ML 1.9 | – | – |
| 1997-04-22 | SEVENIG (DE) | ML 1.7 | – | 6.8 |
Nearest beyond 10 km
| Date | Place | Magnitude | Intensity | Distance km |
|---|---|---|---|---|
| 1987-12-17 | GRAND DUCH.LUXEMB. | ML 1.9 | – | 11.2 |
| 1998-11-10 | HIMMIGHOFEN (DE) | ML 1.2 | – | 11.8 |
| 1999-09-12 | NOERTERSHAUSEN (DE) | ML 0.8 | – | 11.8 |
| 2000-05-10 | PLAIDT (DE) | ML 1.2 | – | 11.8 |
| 2012-03-18 | REULAND (BE) | ML 1.3 | – | 12.7 |
Notes and method
Tectonic and induced earthquakes from the Observatory’s catalogue, suspected ones included; quarry blasts, explosions and other events are not counted. Epicentral distances on the WGS84 ellipsoid.
Municipality: 2025 municipal boundaries (Statbel), applied to every earthquake, including those before the merger of municipalities. For an epicentre outside Belgium, only the circular area is given. Each earthquake’s name is the catalogue’s: it may refer to a place near the epicentre.
Magnitude: the one given on each earthquake’s page (ML preferably, otherwise MW or MS); magnitudes of different types are compared as they are.
The epicentres of historical earthquakes are only known to within a few kilometres, sometimes more: whether they fall in the area is indicative. Small earthquakes have only been recorded as the station network grew: the area’s older earthquakes are mostly the largest ones, and recent activity looks more frequent.
When the area holds fewer than 5 other earthquakes, the nearest ones beyond 10 km are listed too, up to 100 km. Sequences (aftershocks, swarms) take a single row there, that of their largest earthquake: an earthquake joins a sequence if it occurs at most 7 days after the previous one and within 5 km of the first.
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
- 51.8 – 257.7km
- Mean velocity, P wave
- 7.9km/s
- Mean velocity, S wave
- 4.4km/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. Hypocenter at a depth of 13.5 km. P wave: 14 measurements, root-mean-square deviation 1.45 s. S wave: 10 measurements, root-mean-square deviation 3.06 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)5 stations | |||||
| WLFWalferdange | 51.8 | 189 | 01:54:34.70+9.43 s | 01:54:41.00+15.73 s | 6.30 |
| MEMSMembach | 57.1 | 341 | 01:54:35.12+9.85 s | 01:54:41.24+15.97 s | 6.12 |
| STISart Tilman | 71.6 | 316 | 01:54:37.66+12.39 s | – | – |
| DOUDourbes | 119.8 | 269 | 01:54:45.30+20.03 s | 01:54:58.90+33.63 s | 13.60 |
| SNFSeneffe | 147.8 | 288 | 01:54:49.80+24.53 s | – | – |
| Bensberg seismic network (University of Cologne, Germany)4 stations | |||||
| KLLKalltalsperre | 58.3 | 3 | 01:54:36.30+11.03 s | 01:54:42.00+16.73 s | 5.70 |
| STBSteinbachtalsperre | 66.3 | 38 | 01:54:36.50+11.23 s | – | – |
| BGGBurg Eltz | 76.8 | 83 | 01:54:38.30+13.03 s | 01:54:46.30+21.03 s | 8.00 |
| BNSBensberg | 113.5 | 34 | 01:54:44.50+19.23 s | 01:54:58.80+33.53 s | 14.30 |
| Network LDG2 stations | |||||
| HAUHAUDOMPRE | 235.6 | 179 | 01:55:04.00+38.73 s | – | – |
| BSFBALLON SERVANCE | 257.7 | 171 | 01:55:08.00+42.73 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| ENNEPEN (Intl) | 75.7 | 341 | 01:54:39.00+13.73 s | 01:54:47.30+22.03 s | 8.30 |
| Network FR1 station | |||||
| ABHAlteburg | 95.5 | 106 | 01:54:42.20+16.93 s | – | – |
| Network JCK1 station | |||||
| GSHGrosshau | 68.6 | 7 | 01:54:37.20+11.93 s | 01:54:45.10+19.83 s | 7.90 |
| Network KRW1 station | |||||
| BUHBUEHLERHOEHE | 214.8 | 138 | 01:54:59.50+34.23 s | – | – |
| Network not specified3 stations | |||||
| BIRBoering | 73.6 | 129 | 01:54:38.50+13.23 s | – | – |
| ELGlasserg | 76.9 | 83 | 01:54:38.30+13.03 s | 01:54:46.20+20.93 s | 7.90 |
| GESDglees | 113.8 | 37 | 01:54:38.50+13.23 s | 01:54:46.60+21.33 s | 8.10 |