Earthquake with magnitude of Md 2.8 on date 13-01-1985 and time 19:43:36 (Italy) in region 6 km NE Borgo San Lorenzo (FI)

A magnitude Md 2.8 earthquake occured in region: 6 km NE Borgo San Lorenzo (FI), on

  • 13-01-1985 18:43:36 (UTC)
  • 13-01-1985 19:43:36 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.99, 11.43 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
Borgo San Lorenzo FI 6 18211 18211
Vicchio FI 7 8044 26255
Scarperia e San Piero FI 9 12217 38472
Dicomano FI 13 5515 43987
Firenzuola FI 15 4726 48713
Vaglia FI 15 5073 53786
Barberino di Mugello FI 16 10836 64622
Palazzuolo sul Senio FI 16 1154 65776
San Godenzo FI 17 1167 66943
Marradi FI 17 3139 70082
Londa FI 18 1840 71922
Rufina FI 19 7346 79268

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km NE of Firenze (382808 inhabitants)
30 Km E of Prato (191150 inhabitants)
33 Km NE of Scandicci (50609 inhabitants)
42 Km E of Pistoia (90315 inhabitants)
46 Km SW of Imola (69797 inhabitants)
49 Km SW of Faenza (58541 inhabitants)
55 Km W of Forlì (117913 inhabitants)
56 Km S of Bologna (386663 inhabitants)
67 Km W of Cesena (96758 inhabitants)
69 Km NW of Arezzo (99543 inhabitants)
75 Km N of Siena (53903 inhabitants)
76 Km E of Lucca (89046 inhabitants)
77 Km SW of Ravenna (159116 inhabitants)
83 Km SE of Modena (184973 inhabitants)
88 Km E of Pisa (89158 inhabitants)
91 Km W of Rimini (147750 inhabitants)
95 Km S of Ferrara (133155 inhabitants)
96 Km E of Viareggio (62467 inhabitants)
98 Km SE of Carpi (70699 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 2.8 1985-01-13
18:43:36
43.99 11.43 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 469
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-01-13 18:43:36 ± 0.21
Latitude 43.99 ± 0.02
Longitude 11.43 ± 0.03
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 469

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) 3221
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 126
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00469
Epicentral distance of station farthest from the epicenter (degree) 0.02582
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

Md:2.8

Field Value
Value 2.8
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 469
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:05:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.RBL.Z. 1985-01-13T18:44:22.00 10.0 undecidable manual PN 31 0.0258 0.02 1.1
--.FO1.Z. 1985-01-13T18:44:20.50 10.0 undecidable manual PN 19 0.0249 -0.05 1.1
--.ARV.Z. 1985-01-13T18:44:17.00 10.0 undecidable manual SN 114 0.0108 1.53 0
--.MNS.Z. 1985-01-13T18:44:08.00 10.0 undecidable manual PN 150 0.0166 0.07 1.4
--.PO9.Z. 1985-01-13T18:44:07.50 10.0 undecidable manual PN 142 0.0161 0.31 1.1
--.ASS.Z. 1985-01-13T18:44:00.00 10.0 undecidable manual PN 136 0.0115 -0.18 1.4
--.ARV.Z. 1985-01-13T18:43:58.50 10.0 undecidable manual PN 114 0.0108 -0.51 0.7
--.BDI.Z. 1985-01-13T18:43:49.00 10.0 undecidable manual PG 277 0.0054 0.15 1.4
--.CRE.Z. 1985-01-13T18:43:47.00 10.0 undecidable manual PG 135 0.0047 -0.41 0.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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