Earthquake with magnitude of Md 2.6 on date 09-02-1985 and time 23:58:44 (UTC) in region 3 km E Guidonia Montecelio (RM)

A magnitude Md 2.6 earthquake occured in region: 3 km E Guidonia Montecelio (RM), on

  • 09-02-1985 23:58:44 (UTC)
  • 10-02-1985 00:58:44 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.99, 12.76 at 5 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Guidonia Montecelio RM 3 88673 88673
Tivoli RM 4 56533 145206
Marcellina RM 5 7280 152486
Sant'Angelo Romano RM 7 5018 157504
San Polo dei Cavalieri RM 7 2992 160496
Palombara Sabina RM 9 13269 173765
Castel Madama RM 9 7399 181164
Vicovaro RM 11 4019 185183
Mentana RM 12 22921 208104
San Gregorio da Sassola RM 12 1619 209723
Fonte Nuova RM 12 32562 242285
Roccagiovine RM 13 263 242548
Casape RM 14 744 243292
Gallicano nel Lazio RM 14 6334 249626
Mandela RM 14 917 250543
Monterotondo RM 14 40830 291373
Moricone RM 14 2650 294023
Sambuci RM 14 925 294948
Monteflavio RM 15 1348 296296
Licenza RM 15 1011 297307
Ciciliano RM 15 1336 298643
Poli RM 16 2418 301061
Saracinesco RM 16 185 301246
Montelibretti RM 17 5323 306569
Percile RM 17 255 306824
Montorio Romano RM 17 1984 308808
Colonna RM 17 4287 313095
Zagarolo RM 17 17843 330938
Cineto Romano RM 18 601 331539
Pisoniano RM 18 770 332309
Cerreto Laziale RM 19 1118 333427
Anticoli Corrado RM 19 915 334342
San Cesareo RM 19 15153 349495
Castel San Pietro Romano RM 19 902 350397
Nerola RM 19 1926 352323
Palestrina RM 20 21672 373995
Roviano RM 20 1351 375346
Monte Porzio Catone RM 20 8693 384039
Gerano RM 20 1263 385302

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km E of Guidonia Montecelio (88673 inhabitants)
4 Km NW of Tivoli (56533 inhabitants)
26 Km E of Roma (2864731 inhabitants)
34 Km N of Velletri (53303 inhabitants)
42 Km NE of Pomezia (62966 inhabitants)
45 Km N of Aprilia (73446 inhabitants)
50 Km E of Fiumicino (78395 inhabitants)
59 Km N of Latina (125985 inhabitants)
61 Km N of Anzio (54211 inhabitants)
64 Km S of Terni (111501 inhabitants)
66 Km SW of L'Aquila (69753 inhabitants)
72 Km SE of Viterbo (67173 inhabitants)
81 Km E of Civitavecchia (52991 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 Md 2.6
ML-VAX 2.6
1985-02-09
23:58:44
41.99 12.77 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 1439
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-09 23:58:44 ± 0.251
Latitude 41.99 ± 0.01
Longitude 12.77 ± 0.03
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 1439

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 2476.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 151
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.8
Epicentral distance of station closest to the epicenter (degree) 0.00202
Epicentral distance of station farthest from the epicenter (degree) 0.01562
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 1439
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:06:33

ML:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 1439
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CH1.Z. 1985-02-09T23:59:16.00 10.0 undecidable manual PN 340 0.0156 0.68 0.6
--.SD1.Z. 1985-02-09T23:59:14.00 10.0 undecidable manual SG 109 0.0074 0.05 1.1
--.AR1.Z. 1985-02-09T23:59:12.90 10.0 undecidable manual PN 4 0.0136 0.73 0.7
--.PO9.Z. 1985-02-09T23:59:07.50 10.0 undecidable manual SG 12 0.0053 0.84 1.1
--.AS1.Z. 1985-02-09T23:59:05.20 10.0 undecidable manual PG 355 0.0096 -0.94 1
--.SD1.Z. 1985-02-09T23:59:00.10 10.0 undecidable manual PG 109 0.0074 -1.42 1.1
--.MNS.Z. 1985-02-09T23:58:59.80 10.0 undecidable manual SG 351 0.0036 -0.27 1.1
--.AQU.Z. 1985-02-09T23:58:58.50 10.0 undecidable manual PG 52 0.0053 1.24 1.1
--.PO9.Z. 1985-02-09T23:58:57.00 10.0 undecidable manual PG 12 0.0053 -0.31 1.1
--.RDP.Z. 1985-02-09T23:58:54.20 10.0 undecidable manual SG 188 0.002 0.52 1.1
--.MNS.Z. 1985-02-09T23:58:53.00 10.0 negative manual PG 351 0.0036 -0.51 1.1
--.RDP.Z. 1985-02-09T23:58:49.70 10.0 negative manual PG 188 0.002 -0.11 1.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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