Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 07-08-1999 and time 01:54:50 (Italy) in region 1 km W Barberino Val d'Elsa (FI)

A magnitude Md 2.5 earthquake occured in region: 1 km W Barberino Val d'Elsa (FI), on

  • 06-08-1999 23:54:50 (UTC)
  • 07-08-1999 01:54:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.5450, 11.1610 at 9 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
Barberino Val d'Elsa FI 1 4386 4386
Tavarnelle Val di Pesa FI 2 7800 12186
Poggibonsi SI 9 29196 41382
Certaldo FI 10 16121 57503
San Gimignano SI 13 7820 65323
San Casciano in Val di Pesa FI 13 17062 82385
Montespertoli FI 13 13537 95922
Castellina in Chianti SI 13 2859 98781
Greve in Chianti FI 13 13862 112643
Colle di Val d'Elsa SI 14 21620 134263
Gambassi Terme FI 17 4870 139133
Castelfiorentino FI 17 17504 156637
Monteriggioni SI 17 9810 166447
Impruneta FI 18 14615 181062
Radda in Chianti SI 18 1613 182675

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km S of Scandicci (50609 inhabitants)
26 Km SW of Firenze (382808 inhabitants)
29 Km NW of Siena (53903 inhabitants)
38 Km S of Prato (191150 inhabitants)
48 Km SE of Pistoia (90315 inhabitants)
59 Km W of Arezzo (99543 inhabitants)
63 Km SE of Lucca (89046 inhabitants)
64 Km E of Pisa (89158 inhabitants)
69 Km E of Livorno (159219 inhabitants)
82 Km E of Viareggio (62467 inhabitants)
87 Km N of Grosseto (82087 inhabitants)
98 Km SE of Massa (69479 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
ML-VAX 1.5 		1999-08-06
23:54:50		 43.545 11.161 9 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 371719
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1999-08-06 23:54:50 ± 0.206
Latitude 43.5450 ± 0.0129
Longitude 11.1610 ± 0.0157
Depth (km) 9 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 371719

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) 1913.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
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) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00105
Epicentral distance of station farthest from the epicenter (degree) 0.01190
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 7
Type of magnitude Md
Reference to an origin 371719
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 22:48:51

ML:1.5

Field Value
Value 1.5
Uncertainty
Num. used stations 7
Type of magnitude ML
Reference to an origin 371719
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.SNTG.Z. 1999-08-06T23:55:16.30 10.0 undecidable manual PN 102 1.3209 0.84 0.3
--.FB9.Z. 1999-08-06T23:55:13.98 10.0 undecidable manual PN 82 1.1766 0.79 0.4
--.ASS.Z. 1999-08-06T23:55:13.40 10.0 undecidable manual PN 113 1.1877 0.09 1.2
--.EB9.Z. 1999-08-06T23:55:11.81 10.0 undecidable manual PG 328 1.0212 0.8 0.5
--.SFI.Z. 1999-08-06T23:55:11.70 10.0 undecidable manual SG 53 0.6105 -0.87 0.1
--.CRE.Z. 1999-08-06T23:55:10.51 10.0 undecidable manual SG 82 0.5772 -0.92 0.1
--.GU9.Z. 1999-08-06T23:55:09.48 10.0 undecidable manual PG 333 0.8991 0.72 0.6
--.PII.Z. 1999-08-06T23:55:08.00 10.0 undecidable manual SG 291 0.4884 -0.74 0.1
--.GRFL.Z. 1999-08-06T23:55:06.53 10.0 undecidable manual SG 198 0.4107 0.13 0.6
--.BDI.Z. 1999-08-06T23:55:04.60 10.0 undecidable manual PG 322 0.6549 -0.12 1.4
--.CRE.Z. 1999-08-06T23:55:02.62 10.0 undecidable manual PG 82 0.5772 -0.07 1.5
--.SFI.Z. 1999-08-06T23:55:02.77 10.0 undecidable manual PG 53 0.6105 -0.57 0.8
--.PII.Z. 1999-08-06T23:55:00.96 10.0 negative manual PG 291 0.4884 -0.17 2.7
--.GRFL.Z. 1999-08-06T23:54:59.60 10.0 undecidable manual PG 198 0.4107 -0.18 1.4
--.CSNT.Z. 1999-08-06T23:54:53.90 10.0 negative manual PG 127 0.1221 0 3.1
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