Earthquake with magnitude of Md 2.4 on date 20-03-1985 and time 09:45:37 (UTC) in region 5 km E San Godenzo (FI)

A magnitude Md 2.4 earthquake occured in region: 5 km E San Godenzo (FI), on

  • 20-03-1985 09:45:37 (UTC)
  • 20-03-1985 10:45:37 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.92, 11.69 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
San Godenzo FI 5 1167 1167
Premilcuore FC 9 799 1966
Londa FI 12 1840 3806
Dicomano FI 13 5515 9321
Portico e San Benedetto FC 14 756 10077
Pratovecchio Stia AR 15 5845 15922
Vicchio FI 18 8044 23966
Marradi FI 18 3139 27105
Santa Sofia FC 18 4136 31241
Tredozio FC 18 1212 32453
Rufina FI 19 7346 39799
Galeata FC 20 2516 42315
Rocca San Casciano FC 20 1910 44225

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Firenze (382808 inhabitants)
43 Km SW of Faenza (58541 inhabitants)
44 Km SW of Forlì (117913 inhabitants)
44 Km E of Scandicci (50609 inhabitants)
47 Km E of Prato (191150 inhabitants)
48 Km S of Imola (69797 inhabitants)
51 Km W of Cesena (96758 inhabitants)
53 Km NW of Arezzo (99543 inhabitants)
62 Km E of Pistoia (90315 inhabitants)
69 Km SW of Ravenna (159116 inhabitants)
69 Km SE of Bologna (386663 inhabitants)
72 Km W of Rimini (147750 inhabitants)
73 Km NE of Siena (53903 inhabitants)
95 Km E of Lucca (89046 inhabitants)
98 Km W of Pesaro (94582 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 2.4 1985-03-20
09:45:37
43.92 11.69 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 3389
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-03-20 09:45:37 ± 0.73
Latitude 43.92 ± 0.05
Longitude 11.69 ± 0.04
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 3389

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) 6583.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 227
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) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00308
Epicentral distance of station farthest from the epicenter (degree) 0.00769
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:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 3389
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:08:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.PS9.Z. 1985-03-20T09:46:06.00 10.0 undecidable manual SG 256 0.0077 -1.26 0.1
--.BD1.Z. 1985-03-20T09:46:03.50 10.0 undecidable manual SG 280 0.0071 -1.61 0
--.PS9.Z. 1985-03-20T09:45:55.00 10.0 undecidable manual PG 256 0.0077 0.25 1.4
--.BD1.Z. 1985-03-20T09:45:54.00 10.0 undecidable manual PG 280 0.0071 0.49 1.2
--.CH1.Z. 1985-03-20T09:45:51.00 10.0 undecidable manual SG 147 0.0032 0.13 0.7
--.FIR.N. 1985-03-20T09:45:51.00 10.0 undecidable manual SG 244 0.0031 0.34 0.6
--.FIR.Z. 1985-03-20T09:45:46.00 10.0 undecidable manual PG 244 0.0031 0.83 0.8
--.CH1.Z. 1985-03-20T09:45:45.00 10.0 negative manual PG 147 0.0032 -0.29 3.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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