Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 27-10-2023 and time 15:48:43 (Italy) in region 4 km W San Gimignano (SI)

A magnitude ML 1.3 earthquake occured in region: 4 km W San Gimignano (SI), on

  • 27-10-2023 13:48:43 (UTC)
  • 27-10-2023 15:48:43 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4600, 10.9970 at 11 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
San Gimignano SI 4 7820 7820
Gambassi Terme FI 10 4870 12690
Certaldo FI 11 16121 28811
Colle di Val d'Elsa SI 11 21620 50431
Poggibonsi SI 12 29196 79627
Montaione FI 12 3700 83327
Volterra PI 13 10519 93846
Casole d'Elsa SI 14 3897 97743
Castelfiorentino FI 16 17504 115247
Barberino Val d'Elsa FI 17 4386 119633
Tavarnelle Val di Pesa FI 18 7800 127433
Monteriggioni SI 19 9810 137243

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km NW of Siena (53903 inhabitants)
37 Km SW of Scandicci (50609 inhabitants)
40 Km SW of Firenze (382808 inhabitants)
48 Km S of Prato (191150 inhabitants)
53 Km S of Pistoia (90315 inhabitants)
56 Km SE of Pisa (89158 inhabitants)
56 Km E of Livorno (159219 inhabitants)
58 Km SE of Lucca (89046 inhabitants)
72 Km W of Arezzo (99543 inhabitants)
75 Km SE of Viareggio (62467 inhabitants)
78 Km N of Grosseto (82087 inhabitants)
94 Km SE of Massa (69479 inhabitants)
100 Km SE of Carrara (63133 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
Reviewed
Rev100 		ML 1.3 2023-10-27
13:48:43		 43.46 10.9967 11 2023-10-27
13:56:34		 Sala Sismica INGV-Roma 122462351
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-27 13:48:43 ± 0.12
Latitude 43.4600 ± 0.0063
Longitude 10.9967 ± 0.0112
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 122462351

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 910
Semi-minor axis of confidence ellipse (meter) 660
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 248
Circular confidence region, given by single value of horizontal uncertainty (meter) 910.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 117
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) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.19156
Epicentral distance of station farthest from the epicenter (degree) 0.56028
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 122462351
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-27 13:56:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MOCL.EHZ. 2023-10-27T13:48:55.08 0.1 undecidable manual P 14 62.1933 50 0.4 86
IV.CRMI.HHZ. 2023-10-27T13:48:55.63 0.3 undecidable manual S 358 37.2294 50 -0.45 67
IV.RUFI.EHZ. 2023-10-27T13:48:54.59 0.1 undecidable manual P 44 58.7967 50 0.44 86
IV.LOCA.HHE. 2023-10-27T13:48:53.26 0.3 undecidable manual S 128 27.3504 50 -0.18 72
IV.FROS.CHZ. 2023-10-27T13:48:53.69 0.3 undecidable manual S 155 30.6471 50 -0.62 64
IV.CSNT.HHZ. 2023-10-27T13:48:52.37 0.1 undecidable manual S 86 23.6541 50 -0.09 99
IV.PII.HHZ. 2023-10-27T13:48:52.12 0.1 undecidable manual P 308 47.7189 50 -0.33 90
IV.TRIF.CHE. 2023-10-27T13:48:51.62 0.1 undecidable manual P 191 39.0276 50 0.51 88
IV.OSSC.HHN. 2023-10-27T13:48:51.68 0.3 undecidable manual S 71 21.2676 50 -0.13 74
IV.CRMI.HHZ. 2023-10-27T13:48:50.68 0.1 undecidable manual P 358 37.2294 50 -0.15 95
IV.LOCA.HHE. 2023-10-27T13:48:49.46 0.1 undecidable manual P 128 27.3504 50 0.15 97
IV.FROS.CHZ. 2023-10-27T13:48:49.77 0.1 undecidable manual P 155 30.6471 50 -0.04 98
IV.OSSC.HHN. 2023-10-27T13:48:48.50 0.1 undecidable manual P 71 21.2676 50 0.13 98
IV.CSNT.HHZ. 2023-10-27T13:48:48.76 0.1 undecidable manual P 86 23.6541 50 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRMI.HHE. ML:1.5 0.00012817549 2.016 AML other m 2023-10-27T13:48:54.64
IV.CRMI.HHN. ML:1.0 0.000037266295999999995 0.9792 AML other m 2023-10-27T13:48:56.09
IV.CSNT.HHE. ML:1.2 0.00009364505 0.1792 AML other m 2023-10-27T13:48:52.75
IV.CSNT.HHN. ML:1.3 0.00012269863 0.1216 AML other m 2023-10-27T13:48:52.49
IV.FROS.CHE. ML:1.4 0.00011868270000000001 1.216 AML other m 2023-10-27T13:48:54.24
IV.FROS.CHN. ML:1.1 0.00006627361499999999 0.1728 AML other m 2023-10-27T13:48:53.82
IV.CRMI.HNE. ML:1.3 0.00006890024 1.1904 AML other m 2023-10-27T13:48:55.71
IV.CRMI.HNN. ML:1.5 0.00011413584 1.376 AML other m 2023-10-27T13:48:56.44
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