Earthquake with magnitude of Md 3.5 on date 23-01-1986 and time 18:38:57 (Italy) in region 6 km W Sefro (MC)

A magnitude Md 3.5 earthquake occured in region: 6 km W Sefro (MC), on

  • 23-01-1986 17:38:57 (UTC)
  • 23-01-1986 18:38:57 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.13, 12.88 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
Sefro MC 6 422 422
Nocera Umbra PG 7 5839 6261
Fiuminata MC 8 1402 7663
Serravalle di Chienti MC 9 1070 8733
Pioraco MC 11 1134 9867
Valtopina PG 12 1398 11265
Gualdo Tadino PG 14 15208 26473
Muccia MC 15 915 27388
Esanatoglia MC 15 2034 29422
Camerino MC 16 6974 36396
Pieve Torina MC 17 1458 37854
Castelraimondo MC 17 4587 42441
Matelica MC 18 9981 52422
Monte Cavallo MC 18 145 52567
Pievebovigliana MC 19 866 53433
Gagliole MC 20 620 54053

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km NE of Foligno (57155 inhabitants)
40 Km E of Perugia (166134 inhabitants)
66 Km N of Terni (111501 inhabitants)
75 Km SW of Ancona (100861 inhabitants)
80 Km S of Fano (60888 inhabitants)
85 Km NW of Teramo (54892 inhabitants)
87 Km S of Pesaro (94582 inhabitants)
89 Km E of Arezzo (99543 inhabitants)
96 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
Bulletin
Rev1000
Md 3.5 1986-01-23
17:38:57
43.13 12.88 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 21559
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-01-23 17:38:57 ± 0.256
Latitude 43.13 ± 0.01
Longitude 12.88 ± 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 21559

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) 3026.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 140
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
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) 0.00154
Epicentral distance of station farthest from the epicenter (degree) 0.03861
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitude information

Md:3.5

Field Value
Value 3.5
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 21559
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:23:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CTI.Z. 1986-01-23T17:40:22.00 10.0 undecidable manual SN 343 0.0274 0.57 0.4
--.ORO.Z. 1986-01-23T17:40:03.00 10.0 undecidable manual PN? 307 0.0386 0 0.4
--.MDI.Z. 1986-01-23T17:39:53.00 10.0 undecidable manual PN 320 0.0312 1.22 0.5
--.FO1.Z. 1986-01-23T17:39:52.50 10.0 undecidable manual PN 358 0.0312 0.93 0.7
--.RBL.Z. 1986-01-23T17:39:51.00 10.0 undecidable manual PN 8 0.0301 1.03 0.7
--.CTI.Z. 1986-01-23T17:39:46.30 10.0 undecidable manual PN 343 0.0274 0.48 1
--.TRI.Z. 1986-01-23T17:39:40.50 10.0 undecidable manual PN 13 0.0239 0.02 1.2
--.BDI.Z. 1986-01-23T17:39:31.50 10.0 undecidable manual PN 300 0.017 1.46 0.5
--.CRE.Z. 1986-01-23T17:39:27.00 10.0 undecidable manual SG 306 0.0074 0.24 0.9
--.SD1.Z. 1986-01-23T17:39:26.80 10.0 undecidable manual PN 153 0.0142 1.11 0.8
--.MAO.Z. 1986-01-23T17:39:24.50 10.0 undecidable manual PN 241 0.013 0.57 1.2
--.MNS.Z. 1986-01-23T17:39:24.00 10.0 undecidable manual SG 190 0.0068 -0.37 0.9
--.FIR.Z. 1986-01-23T17:39:23.00 10.0 undecidable manual PN 299 0.0121 0.56 1.3
--.RDP.Z. 1986-01-23T17:39:23.00 10.0 positive manual PN 184 0.0123 0.1 3
--.CRE.Z. 1986-01-23T17:39:12.80 10.0 positive manual PG 306 0.0074 -1.46 1.2
--.MNS.Z. 1986-01-23T17:39:11.20 10.0 positive manual PG 190 0.0068 -1.68 0.9
--.ARV.Z. 1986-01-23T17:39:11.00 10.0 undecidable manual SG 7 0.0033 -0.67 0.7
--.ARV.Z. 1986-01-23T17:39:04.25 10.0 positive manual PG 7 0.0033 -1.3 1.3
--.ASS.Z. 1986-01-23T17:39:01.00 10.0 undecidable manual PG 247 0.0015 -0.23 1.5
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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