Earthquake with magnitude of Md 2.1 on date 16-04-1985 and time 23:51:51 (Italy) in region 6 km W Stroncone (TR)

A magnitude Md 2.1 earthquake occured in region: 6 km W Stroncone (TR), on

  • 16-04-1985 21:51:51 (UTC)
  • 16-04-1985 23:51:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.48, 12.59 at 10 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
Stroncone TR 6 4917 4917
Narni TR 7 19785 24702
Configni RI 8 633 25335
Calvi dell'Umbria TR 9 1856 27191
Terni TR 10 111501 138692
Otricoli TR 11 1869 140561
Vacone RI 11 256 140817
Cottanello RI 12 563 141380
Montebuono RI 13 883 142263
Montasola RI 13 395 142658
Tarano RI 14 1444 144102
San Gemini TR 15 5018 149120
Torri in Sabina RI 15 1256 150376
Greccio RI 15 1558 151934
Colli sul Velino RI 16 533 152467
Magliano Sabina RI 16 3774 156241
Contigliano RI 17 3783 160024
Collevecchio RI 17 1577 161601
Orte VT 17 8923 170524
Amelia TR 17 11897 182421
Casperia RI 17 1246 183667
Labro RI 18 374 184041
Arrone TR 18 2763 186804
Selci RI 18 1106 187910
Montefranco TR 19 1276 189186
Penna in Teverina TR 19 1099 190285
Gallese VT 20 2849 193134
Roccantica RI 20 563 193697
Cantalupo in Sabina RI 20 1685 195382

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km SW of Terni (111501 inhabitants)
41 Km E of Viterbo (67173 inhabitants)
53 Km S of Foligno (57155 inhabitants)
55 Km N of Guidonia Montecelio (88673 inhabitants)
60 Km N of Tivoli (56533 inhabitants)
66 Km N of Roma (2864731 inhabitants)
68 Km W of L'Aquila (69753 inhabitants)
71 Km S of Perugia (166134 inhabitants)
79 Km NE of Civitavecchia (52991 inhabitants)
84 Km NE of Fiumicino (78395 inhabitants)
90 Km N of Velletri (53303 inhabitants)
91 Km N of Pomezia (62966 inhabitants)
93 Km W of Teramo (54892 inhabitants)
99 Km N of Aprilia (73446 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 2.1 1985-04-16
21:51:51
42.48 12.59 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 4799
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-16 21:51:51 ± 0.131
Latitude 42.48 ± 0.00
Longitude 12.59 ± 0.01
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 4799

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) 1148.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 218
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00105
Epicentral distance of station farthest from the epicenter (degree) 0.00518
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 4799
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:09:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AS1.Z. 1985-04-16T21:52:12.00 10.0 undecidable manual SG 4 0.0052 0.28 0.2
--.AS1.Z. 1985-04-16T21:52:03.00 10.0 undecidable manual PG 4 0.0052 -0.04 1.6
--.PO9.Z. 1985-04-16T21:52:02.00 10.0 undecidable manual SG 70 0.0024 0.13 0.7
--.PO9.Z. 1985-04-16T21:51:57.00 10.0 undecidable manual PG 70 0.0024 -0.35 0.5
--.MNS.Z. 1985-04-16T21:51:57.00 10.0 undecidable manual SG 146 0.0011 0.08 0.8
--.MNS.Z. 1985-04-16T21:51:54.50 10.0 undecidable manual PG 146 0.0011 0.01 2.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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