Earthquake with magnitude of Md 2.8 on date 21-02-1985 and time 04:27:24 (UTC) in region Costa Toscana livornese (Livorno)

A magnitude Md 2.8 earthquake occured in region: Costa Toscana livornese (Livorno), on

  • 21-02-1985 04:27:24 (UTC)
  • 21-02-1985 05:27:24 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.59, 10.26 at 6 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
Livorno LI 6 159219 159219
Collesalvetti LI 17 16827 176046
Pisa PI 18 89158 265204

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km NW of Livorno (159219 inhabitants)
18 Km SW of Pisa (89158 inhabitants)
31 Km S of Viareggio (62467 inhabitants)
34 Km SW of Lucca (89046 inhabitants)
50 Km S of Massa (69479 inhabitants)
56 Km S of Carrara (63133 inhabitants)
65 Km SW of Pistoia (90315 inhabitants)
67 Km SE of La Spezia (93959 inhabitants)
74 Km W of Prato (191150 inhabitants)
76 Km W of Scandicci (50609 inhabitants)
82 Km W of Firenze (382808 inhabitants)
92 Km W of Siena (53903 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 1985-02-21
04:27:24
43.59 10.26 6 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 2089
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-21 04:27:24 ± 1.297
Latitude 43.59 ± 0.08
Longitude 10.26 ± 0.05
Depth (km) 6 ± 7 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2089

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) 9649.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 193
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.9
Epicentral distance of station closest to the epicenter (degree) 0.00202
Epicentral distance of station farthest from the epicenter (degree) 0.01668
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:2.8

Field Value
Value 2.8
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 2089
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.IMP.Z. 1985-02-21T04:28:14.00 10.0 undecidable manual SN 281 0.0156 -3.1 0.1
--.VEA.Z. 1985-02-21T04:28:13.00 10.0 undecidable manual SN 340 0.0123 4.61 0
--.FIN.Z. 1985-02-21T04:28:10.40 10.0 undecidable manual SN 293 0.0144 -3.39 0
--.GEN.Z. 1985-02-21T04:28:06.80 10.0 undecidable manual SN 311 0.0113 1.14 0.5
--.ROB.Z. 1985-02-21T04:27:56.50 10.0 undecidable manual PN 293 0.0167 0.1 1.3
--.IMP.Z. 1985-02-21T04:27:53.80 10.0 undecidable manual PN 281 0.0156 -0.97 1.1
--.CK1.Z. 1985-02-21T04:27:53.50 10.0 undecidable manual PN 300 0.0148 0.01 1.4
--.FIN.Z. 1985-02-21T04:27:52.20 10.0 undecidable manual PN 293 0.0144 -0.66 1.3
--.VEA.Z. 1985-02-21T04:27:52.50 10.0 undecidable manual PN 340 0.0123 2.76 0.3
--.FIR.N. 1985-02-21T04:27:50.00 10.0 undecidable manual SG 75 0.0066 -0.6 0.6
--.CH1.Z. 1985-02-21T04:27:49.00 10.0 undecidable manual PN 88 0.0109 1.38 1.1
--.GEN.Z. 1985-02-21T04:27:49.50 10.0 undecidable manual PN 311 0.0113 1.34 1.1
--.BVT.Z. 1985-02-21T04:27:42.80 10.0 undecidable manual PG 340 0.0084 -0.31 1.7
--.BD1.Z. 1985-02-21T04:27:41.50 10.0 undecidable manual SG 27 0.0047 -2.26 0.3
--.FIR.Z. 1985-02-21T04:27:39.00 10.0 undecidable manual PG 75 0.0066 -0.47 1.6
--.BD1.Z. 1985-02-21T04:27:34.50 10.0 undecidable manual PG 27 0.0047 -1.02 1.3
--.PS9.Z. 1985-02-21T04:27:32.50 10.0 undecidable manual SG 56 0.002 -0.8 0.9
--.PS9.Z. 1985-02-21T04:27:29.80 10.0 positive manual PG 56 0.002 0.32 3.3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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