Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 23-12-2023 and time 02:14:31 (UTC) in region 4 km NW Vecchiano (PI)

A magnitude ML 1.2 earthquake occured in region: 4 km NW Vecchiano (PI), on

  • 23-12-2023 02:14:31 (UTC)
  • 23-12-2023 03:14:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.8120, 10.3580 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
Vecchiano PI 4 12189 12189
Massarosa LU 7 22471 34660
San Giuliano Terme PI 9 31399 66059
Viareggio LU 11 62467 128526
Pisa PI 11 89158 217684
Lucca LU 12 89046 306730
Camaiore LU 15 32513 339243
Calci PI 16 6426 345669
Pescaglia LU 18 3526 349195
Capannori LU 18 46252 395447
Pietrasanta LU 20 24007 419454

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km SE of Viareggio (62467 inhabitants)
11 Km NW of Pisa (89158 inhabitants)
12 Km W of Lucca (89046 inhabitants)
29 Km N of Livorno (159219 inhabitants)
30 Km SE of Massa (69479 inhabitants)
36 Km SE of Carrara (63133 inhabitants)
47 Km W of Pistoia (90315 inhabitants)
54 Km SE of La Spezia (93959 inhabitants)
60 Km W of Prato (191150 inhabitants)
66 Km W of Scandicci (50609 inhabitants)
72 Km W of Firenze (382808 inhabitants)
96 Km NW of Siena (53903 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 1.2 2023-12-23
02:14:31		 43.8123 10.3585 11 2023-12-23
02:19:39		 Sala Sismica INGV-Roma 124212491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-12-23 02:14:31 ± 0.26
Latitude 43.8123 ± 0.0108
Longitude 10.3585 ± 0.0199
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 124212491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1636
Semi-minor axis of confidence ellipse (meter) 1036
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 69
Circular confidence region, given by single value of horizontal uncertainty (meter) 1640.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 210
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) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.13939
Epicentral distance of station farthest from the epicenter (degree) 0.45506
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 124212491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-12-23 02:19:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PSL.EHZ. 2023-12-23T02:14:46.78 0.6 undecidable manual S 64 50.5161 50 -0.48 44
GU.EQUI.HHE. 2023-12-23T02:14:44.42 0.6 undecidable manual S 337 42.5241 50 -0.71 40
IV.BDI.HHZ. 2023-12-23T02:14:43.14 0.6 undecidable manual S 34 33.6441 50 0.38 46
IV.PSL.EHZ. 2023-12-23T02:14:40.70 0.6 negative manual P 64 50.5161 50 0.23 46
GU.EQUI.HHE. 2023-12-23T02:14:39.24 1.0 undecidable manual P 337 42.5241 50 0 24
GU.POPM.HHZ. 2023-12-23T02:14:39.09 0.1 positive manual P 51 40.9257 50 0.08 96
GU.MAIM.HHZ. 2023-12-23T02:14:37.32 0.6 undecidable manual S 44 15.4734 124 -0.37 48
IV.PII.HHZ. 2023-12-23T02:14:37.50 0.6 undecidable manual S 127 16.6722 122 -0.56 45
IV.BDI.HHZ. 2023-12-23T02:14:37.99 0.3 negative manual P 34 33.6441 50 0.12 73
GU.CARD.HHZ. 2023-12-23T02:14:36.69 0.1 negative manual P 23 25.6521 50 0.04 100
GU.MAIM.HHZ. 2023-12-23T02:14:35.24 0.1 positive manual P 44 15.4734 124 0.29 97
IV.PII.HHZ. 2023-12-23T02:14:35.32 0.1 negative manual P 127 16.6722 122 0.16 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.MAIM.HHE. ML:1.2 0.0001563455 0.1408 AML other m 2023-12-23T02:14:37.67
GU.MAIM.HHN. ML:1.0 0.000096483935 0.12 AML other m 2023-12-23T02:14:37.77
IV.PII.HHE. ML:1.2 0.000131339 0.24 AML other m 2023-12-23T02:14:38.07
IV.PII.HHN. ML:1.1 0.00009846080500000001 0.16 AML other m 2023-12-23T02:14:37.92
GU.CARD.HHE. ML:0.9 0.00004469173 0.12 AML other m 2023-12-23T02:14:40.07
IV.BDI.HHN. ML:1.0 0.000038244175 1.44 AML other m 2023-12-23T02:14:56.21
IV.BDI.HNE. ML:1.5 0.000123509245 0.6896 AML other m 2023-12-23T02:14:42.91
IV.BDI.HNN. ML:1.7 0.0001979709 0.8704 AML other m 2023-12-23T02:14:44.51
IV.BDI.HHE. ML:0.8 0.0000278567885 0.7408 AML other m 2023-12-23T02:14:50.25
GU.POPM.HHE. ML:0.9 0.00002285239 0.72 AML other m 2023-12-23T02:14:42.03
IV.PSL.EHE. ML:1.6 0.0000932336 2.36 AML other m 2023-12-23T02:14:46.82
IV.PSL.EHN. ML:1.5 0.000087897835 2.68 AML other m 2023-12-23T02:14:44.15
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