INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of Md 2.3 on date 12-12-1985 and time 15:16:39 (UTC) in region 6 km SW Sefro (MC)

A magnitude Md 2.3 earthquake occured in region: 6 km SW Sefro (MC), on

  • 12-12-1985 15:16:39 (UTC)
  • 12-12-1985 16:16:39 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.12, 12.89 at 7 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
Sefro MC 6 422 422
Serravalle di Chienti MC 7 1070 1492
Fiuminata MC 8 1402 2894
Nocera Umbra PG 8 5839 8733
Pioraco MC 10 1134 9867
Valtopina PG 13 1398 11265
Muccia MC 13 915 12180
Camerino MC 15 6974 19154
Gualdo Tadino PG 15 15208 34362
Esanatoglia MC 15 2034 36396
Pieve Torina MC 16 1458 37854
Castelraimondo MC 17 4587 42441
Monte Cavallo MC 17 145 42586
Pievebovigliana MC 17 866 43452
Matelica MC 18 9981 53433
Fiordimonte MC 19 202 53635
Gagliole MC 20 620 54255

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km NE of Foligno (57155 inhabitants)
41 Km E of Perugia (166134 inhabitants)
65 Km NE of Terni (111501 inhabitants)
75 Km SW of Ancona (100861 inhabitants)
81 Km S of Fano (60888 inhabitants)
84 Km NW of Teramo (54892 inhabitants)
88 Km S of Pesaro (94582 inhabitants)
90 Km E of Arezzo (99543 inhabitants)
95 Km NW of L'Aquila (69753 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 2.3 1985-12-12
15:16:39
43.12 12.89 7 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 17949
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-12-12 15:16:39 ± 0.278
Latitude 43.12 ± 0.03
Longitude 12.89 ± 0.03
Depth (km) 7 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 17949

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) 3576.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 123
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00162
Epicentral distance of station farthest from the epicenter (degree) 0.00672
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 17949
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:20:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1985-12-12T15:17:06.50 10.0 undecidable manual SG 191 0.0067 -0.04 0.5
--.ARV.Z. 1985-12-12T15:16:56.00 10.0 undecidable manual SG 5 0.0034 1.46 0.1
--.MNS.Z. 1985-12-12T15:16:55.50 10.0 undecidable manual PG 191 0.0067 0.24 1.1
--.CM2.Z. 1985-12-12T15:16:48.82 10.0 undecidable manual SG 68 0.0017 1.07 0.3
--.ASS.Z. 1985-12-12T15:16:48.00 10.0 undecidable manual SG 251 0.0016 0.7 0.4
--.ARV.Z. 1985-12-12T15:16:47.50 10.0 undecidable manual PG 5 0.0034 -0.83 0.8
--.CM2.Z. 1985-12-12T15:16:44.30 10.0 positive manual PG 68 0.0017 -0.37 3.1
--.ASS.Z. 1985-12-12T15:16:44.00 10.0 undecidable manual PG 251 0.0016 -0.14 1.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download