Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.3 on date 11-07-1991 and time 19:40:21 (UTC) in region 7 km SW Sambuca Pistoiese (PT)

A magnitude Md 2.3 earthquake occured in region: 7 km SW Sambuca Pistoiese (PT), on

  • 11-07-1991 19:40:21 (UTC)
  • 11-07-1991 21:40:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0680, 10.9320 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
Sambuca Pistoiese PT 7 1626 1626
Alto Reno Terme BO 10 6960 8586
Lizzano in Belvedere BO 11 2212 10798
San Marcello Pistoiese PT 11 6416 17214
Castel di Casio BO 14 3448 20662
Piteglio PT 14 1683 22345
Cutigliano PT 15 1488 23833
Gaggio Montano BO 15 4878 28711
Cantagallo PO 15 3105 31816
Pistoia PT 15 90315 122131
Montale PT 16 10737 132868
Camugnano BO 17 1885 134753
Montemurlo PO 18 18456 153209
Vernio PO 18 6060 159269
Vaiano PO 19 9895 169164
Fanano MO 19 2989 172153
Agliana PT 19 17525 189678
Castiglione dei Pepoli BO 20 5648 195326
Marliana PT 20 3210 198536
Serravalle Pistoiese PT 20 11659 210195

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km N of Pistoia (90315 inhabitants)
25 Km NW of Prato (191150 inhabitants)
40 Km NW of Scandicci (50609 inhabitants)
42 Km NW of Firenze (382808 inhabitants)
42 Km NE of Lucca (89046 inhabitants)
58 Km NE of Pisa (89158 inhabitants)
58 Km SW of Bologna (386663 inhabitants)
59 Km E of Viareggio (62467 inhabitants)
63 Km E of Massa (69479 inhabitants)
64 Km S of Modena (184973 inhabitants)
67 Km E of Carrara (63133 inhabitants)
70 Km W of Imola (69797 inhabitants)
74 Km SE of Reggio nell'Emilia (171345 inhabitants)
76 Km NE of Livorno (159219 inhabitants)
80 Km S of Carpi (70699 inhabitants)
80 Km W of Faenza (58541 inhabitants)
88 Km E of La Spezia (93959 inhabitants)
89 Km NW of Siena (53903 inhabitants)
90 Km W of Forlì (117913 inhabitants)
95 Km SE of Parma (192836 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 2.3
ML-VAX 1.9 		1991-07-11
19:40:21		 44.068 10.932 10 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 145159
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-07-11 19:40:21 ± 0.536
Latitude 44.0680 ± 0.0149
Longitude 10.9320 ± 0.0114
Depth (km) 10 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 145159

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) 1892.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 156
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00130
Epicentral distance of station farthest from the epicenter (degree) 0.00607
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:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 145159
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:15:32

ML:1.9

Field Value
Value 1.9
Uncertainty
Num. used stations 2
Type of magnitude ML
Reference to an origin 145159
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
--.SFI.Z. 1991-07-11T19:40:45.40 10.0 undecidable manual SG 103 0.6771 0.27 0.3
--.PGD.Z. 1991-07-11T19:40:41.83 10.0 undecidable manual SG 108 0.5883 -0.41 0.2
--.PII.Z. 1991-07-11T19:40:38.63 10.0 undecidable manual SG 220 0.444 1.03 0
--.SFI.Z. 1991-07-11T19:40:34.53 10.0 undecidable manual PG 103 0.6771 -0.23 0.9
--.PGD.Z. 1991-07-11T19:40:33.33 10.0 undecidable manual PG 108 0.5883 0.03 1.2
--.PII.Z. 1991-07-11T19:40:30.18 10.0 negative manual PG 220 0.444 -0.44 1.2
--.BDI.Z. 1991-07-11T19:40:30.69 10.0 undecidable manual SG 268 0.2331 -0.04 0.6
--.MME.Z. 1991-07-11T19:40:29.59 10.0 undecidable manual SG 307 0.2109 -0.09 0.6
--.PTF.Z. 1991-07-11T19:40:28.40 10.0 undecidable manual SG 137 0.1443 0.68 0.1
--.MME.Z. 1991-07-11T19:40:26.26 10.0 negative manual PG 307 0.2109 0.21 2.5
--.BDI.Z. 1991-07-11T19:40:26.62 10.0 positive manual PG 268 0.2331 -0.03 3
--.PTF.Z. 1991-07-11T19:40:25.00 10.0 undecidable manual PG 137 0.1443 0.09 1.5
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