ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Md 2.9 on date 04-12-1985 and time 21:25:56 (Italy) in region 2 km SE Verghereto (FC)

A magnitude Md 2.9 earthquake occured in region: 2 km SE Verghereto (FC), on

  • 04-12-1985 20:25:56 (UTC)
  • 04-12-1985 21:25:56 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.78, 12.02 at 8 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
Verghereto FC 2 1907 1907
Bagno di Romagna FC 9 6026 7933
Casteldelci RN 11 407 8340
Chiusi della Verna AR 11 2023 10363
Pieve Santo Stefano AR 13 3183 13546
Caprese Michelangelo AR 16 1426 14972
Badia Tedalda AR 16 1087 16059
Chitignano AR 17 899 16958
Sant'Agata Feltria RN 18 2151 19109
Sarsina FC 18 3446 22555
Bibbiena AR 19 12241 34796

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km NE of Arezzo (99543 inhabitants)
43 Km SW of Cesena (96758 inhabitants)
49 Km S of Forlì (117913 inhabitants)
54 Km SW of Rimini (147750 inhabitants)
57 Km S of Faenza (58541 inhabitants)
61 Km E of Firenze (382808 inhabitants)
67 Km E of Scandicci (50609 inhabitants)
68 Km SE of Imola (69797 inhabitants)
72 Km S of Ravenna (159116 inhabitants)
73 Km W of Pesaro (94582 inhabitants)
75 Km E of Prato (191150 inhabitants)
76 Km NE of Siena (53903 inhabitants)
81 Km W of Fano (60888 inhabitants)
81 Km NW of Perugia (166134 inhabitants)
90 Km E of Pistoia (90315 inhabitants)
96 Km SE of Bologna (386663 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 2.9 1985-12-04
20:25:56
43.78 12.02 9 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 17419
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-12-04 20:25:56 ± 0.634
Latitude 43.78 ± 0.03
Longitude 12.02 ± 0.03
Depth (km) 9 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 17419

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) 4168.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
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) 0.02582
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

Md:2.9

Field Value
Value 2.9
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 17419
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:20:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.RBL.Z. 1985-12-04T20:26:43.50 10.0 undecidable manual PN 21 0.0258 1.08 0.8
--.FO1.Z. 1985-12-04T20:26:41.00 10.0 undecidable manual PN 10 0.0257 -1.25 0.6
--.TRI.Z. 1985-12-04T20:26:35.00 10.0 undecidable manual PN 32 0.0206 0.58 1.2
--.BDI.Z. 1985-12-04T20:26:33.00 10.0 undecidable manual SN 285 0.0095 0.22 0.8
--.CO9.Z. 1985-12-04T20:26:32.50 10.0 undecidable manual PN 298 0.0187 0.89 1.1
--.PS9.Z. 1985-12-04T20:26:31.50 10.0 undecidable manual SN 267 0.0097 -1.77 0.2
--.ASS.Z. 1985-12-04T20:26:27.20 10.0 undecidable manual SG 147 0.0077 0.8 0.6
--.MNS.Z. 1985-12-04T20:26:25.00 10.0 undecidable manual PN 160 0.0133 1.67 0.6
--.ARV.Z. 1985-12-04T20:26:22.00 10.0 undecidable manual SG 112 0.0066 -0.31 0.8
--.BDI.Z. 1985-12-04T20:26:17.50 10.0 undecidable manual PN 285 0.0095 -0.04 2
--.PS9.Z. 1985-12-04T20:26:16.30 10.0 undecidable manual PN 267 0.0097 -1.52 0.7
--.ASS.Z. 1985-12-04T20:26:14.20 10.0 undecidable manual PG 147 0.0077 0.34 1.9
--.ARV.Z. 1985-12-04T20:26:09.60 10.0 undecidable manual PG 112 0.0066 -1.89 0.4
--.FIR.Z. 1985-12-04T20:26:09.00 10.0 undecidable manual PG 269 0.0049 0.83 1.5
--.CRE.Z. 1985-12-04T20:26:00.50 10.0 undecidable manual PG 196 0.0015 -0.39 1.8
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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