Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 18-01-1993 and time 05:38:08 (Italy) in region 4 km W Castellina in Chianti (SI)

A magnitude Md 2.5 earthquake occured in region: 4 km W Castellina in Chianti (SI), on

  • 18-01-1993 04:38:08 (UTC)
  • 18-01-1993 05:38:08 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.4750, 11.2320 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Castellina in Chianti SI 4 2859 2859
Poggibonsi SI 7 29196 32055
Barberino Val d'Elsa FI 9 4386 36441
Monteriggioni SI 9 9810 46251
Tavarnelle Val di Pesa FI 11 7800 54051
Colle di Val d'Elsa SI 11 21620 75671
Radda in Chianti SI 12 1613 77284
Greve in Chianti FI 14 13862 91146
San Gimignano SI 15 7820 98966
Gaiole in Chianti SI 16 2758 101724
Certaldo FI 17 16121 117845
Siena SI 19 53903 171748

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km NW of Siena (53903 inhabitants)
32 Km S of Scandicci (50609 inhabitants)
33 Km S of Firenze (382808 inhabitants)
47 Km S of Prato (191150 inhabitants)
53 Km W of Arezzo (99543 inhabitants)
57 Km SE of Pistoia (90315 inhabitants)
72 Km SE of Lucca (89046 inhabitants)
72 Km E of Pisa (89158 inhabitants)
75 Km E of Livorno (159219 inhabitants)
80 Km N of Grosseto (82087 inhabitants)
90 Km E of Viareggio (62467 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 2.5
M 2.5 		1993-01-18
04:38:08		 43.475 11.232 10 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 178909
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1993-01-18 04:38:08 ± 0.407
Latitude 43.4750 ± 0.0255
Longitude 11.2320 ± 0.0161
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 178909

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) 3121.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 221
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
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) 0.00267
Epicentral distance of station farthest from the epicenter (degree) 0.00890
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 178909
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:47:44

M:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 178909
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:49:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.GU9.Z. 1993-01-18T04:38:42.36 10.0 undecidable manual SG 332 0.9879 0.63 0.4
--.BDI.Z. 1993-01-18T04:38:34.68 10.0 undecidable manual SG 322 0.7326 0.84 0.3
--.SFI.Z. 1993-01-18T04:38:31.90 10.0 undecidable manual SG 45 0.6105 1.31 0.1
--.GU9.Z. 1993-01-18T04:38:28.36 10.0 undecidable manual PG 332 0.9879 0.88 0.5
--.CRE.Z. 1993-01-18T04:38:27.64 10.0 undecidable manual SG 74 0.5439 0.35 0.7
--.PII.Z. 1993-01-18T04:38:27.64 10.0 undecidable manual SG 295 0.5661 -0.54 0.6
--.PGD.Z. 1993-01-18T04:38:26.10 10.0 undecidable manual SG 41 0.5328 -0.98 0.2
--.BDI.Z. 1993-01-18T04:38:22.29 10.0 undecidable manual PG 322 0.7326 -0.64 1.1
--.SFI.Z. 1993-01-18T04:38:20.14 10.0 undecidable manual PG 45 0.6105 -0.44 1.6
--.PII.Z. 1993-01-18T04:38:19.60 10.0 undecidable manual PG 295 0.5661 -0.06 2.1
--.CRE.Z. 1993-01-18T04:38:19.45 10.0 undecidable manual PG 74 0.5439 0.3 1.9
--.FIR.Z. 1993-01-18T04:38:19.00 10.0 undecidable manual SG 3 0.2997 -0.54 0.8
--.PGD.Z. 1993-01-18T04:38:18.71 10.0 undecidable manual PG 41 0.5328 -0.32 1.8
--.FIR.Z. 1993-01-18T04:38:14.50 10.0 undecidable manual PG 3 0.2997 -0.17 2
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download