Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.1 on date 29-05-1991 and time 19:55:59 (UTC) in region 3 km NW Montespertoli (FI)

A magnitude Md 2.1 earthquake occured in region: 3 km NW Montespertoli (FI), on

  • 29-05-1991 19:55:59 (UTC)
  • 29-05-1991 21:55:59 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6640, 11.0570 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
Montespertoli FI 3 13537 13537
Montelupo Fiorentino FI 8 14098 27635
Castelfiorentino FI 9 17504 45139
San Casciano in Val di Pesa FI 10 17062 62201
Empoli FI 11 48109 110310
Capraia e Limite FI 11 7670 117980
Lastra a Signa FI 13 20156 138136
Certaldo FI 13 16121 154257
Signa FI 14 19179 173436
Scandicci FI 15 50609 224045
Tavarnelle Val di Pesa FI 15 7800 231845
Gambassi Terme FI 16 4870 236715
Impruneta FI 16 14615 251330
Barberino Val d'Elsa FI 16 4386 255716
San Miniato PI 17 27934 283650
Montaione FI 17 3700 287350
Carmignano PO 17 14450 301800
Poggio a Caiano PO 17 10007 311807
Vinci FI 17 14604 326411
Cerreto Guidi FI 18 10870 337281
Campi Bisenzio FI 19 46166 383447
Firenze FI 20 382808 766255

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km SW of Scandicci (50609 inhabitants)
20 Km SW of Firenze (382808 inhabitants)
24 Km S of Prato (191150 inhabitants)
32 Km SE of Pistoia (90315 inhabitants)
44 Km NW of Siena (53903 inhabitants)
49 Km E of Lucca (89046 inhabitants)
53 Km E of Pisa (89158 inhabitants)
61 Km E of Livorno (159219 inhabitants)
69 Km E of Viareggio (62467 inhabitants)
70 Km W of Arezzo (99543 inhabitants)
84 Km E of Massa (69479 inhabitants)
90 Km SE of Carrara (63133 inhabitants)
93 Km SW of Imola (69797 inhabitants)
95 Km S of Bologna (386663 inhabitants)
96 Km SW of Faenza (58541 inhabitants)
101 Km N of Grosseto (82087 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 2.1
ML-VAX 1.9 		1991-05-29
19:55:59		 43.664 11.057 10 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 142129
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-05-29 19:55:59 ± 0.407
Latitude 43.6640 ± 0.0333
Longitude 11.0570 ± 0.0202
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 142129

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) 4041.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 185
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00348
Epicentral distance of station farthest from the epicenter (degree) 0.00583
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 142129
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:12:41

ML:1.9

Field Value
Value 1.9
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 142129
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
--.CRE.Z. 1991-05-29T19:56:21.83 10.0 undecidable manual SG 93 0.6438 0.02 0.8
--.MME.Z. 1991-05-29T19:56:19.60 10.0 undecidable manual SG 333 0.5883 -0.29 0.7
--.SFI.Z. 1991-05-29T19:56:19.40 10.0 undecidable manual SG 66 0.6105 -1.48 0.2
--.BDI.Z. 1991-05-29T19:56:17.62 10.0 undecidable manual SG 320 0.5106 -0.02 0.8
--.PGD.Z. 1991-05-29T19:56:16.32 10.0 undecidable manual SG 65 0.5217 -1.51 0.2
--.PII.Z. 1991-05-29T19:56:13.15 10.0 undecidable manual SG 278 0.3885 -0.36 0.8
--.MME.Z. 1991-05-29T19:56:12.74 10.0 undecidable manual PG 333 0.5883 1.64 0.3
--.CRE.Z. 1991-05-29T19:56:12.83 10.0 undecidable manual PG 93 0.6438 0.62 1.5
--.SFI.Z. 1991-05-29T19:56:11.91 10.0 undecidable manual PG 66 0.6105 0.23 1.9
--.PGD.Z. 1991-05-29T19:56:10.15 10.0 undecidable manual PG 65 0.5217 0.23 2
--.BDI.Z. 1991-05-29T19:56:09.33 10.0 undecidable manual PG 320 0.5106 -0.47 1.8
--.PII.Z. 1991-05-29T19:56:06.51 10.0 undecidable manual PG 278 0.3885 -0.91 1.2
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