Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 25-02-2024 and time 21:03:08 (UTC) in region 4 km NE Certaldo (FI)

A magnitude ML 1.0 earthquake occured in region: 4 km NE Certaldo (FI), on

  • 25-02-2024 21:03:08 (UTC)
  • 25-02-2024 22:03:08 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.5830, 11.0570 at 10 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
Certaldo FI 4 16121 16121
Montespertoli FI 7 13537 29658
Castelfiorentino FI 7 17504 47162
Gambassi Terme FI 10 4870 52032
Tavarnelle Val di Pesa FI 10 7800 59832
Barberino Val d'Elsa FI 10 4386 64218
Montaione FI 12 3700 67918
San Gimignano SI 13 7820 75738
San Casciano in Val di Pesa FI 13 17062 92800
Poggibonsi SI 15 29196 121996
Montelupo Fiorentino FI 17 14098 136094
Empoli FI 18 48109 184203
Colle di Val d'Elsa SI 19 21620 205823
Capraia e Limite FI 19 7670 213493
Impruneta FI 20 14615 228108
San Miniato PI 20 27934 256042

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SW of Scandicci (50609 inhabitants)
26 Km SW of Firenze (382808 inhabitants)
33 Km S of Prato (191150 inhabitants)
37 Km NW of Siena (53903 inhabitants)
41 Km S of Pistoia (90315 inhabitants)
53 Km SE of Lucca (89046 inhabitants)
55 Km E of Pisa (89158 inhabitants)
60 Km E of Livorno (159219 inhabitants)
68 Km W of Arezzo (99543 inhabitants)
72 Km E of Viareggio (62467 inhabitants)
89 Km SE of Massa (69479 inhabitants)
92 Km N of Grosseto (82087 inhabitants)
95 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 1.0 2024-02-25
21:03:08		 43.5828 11.057 10 2024-02-25
21:09:28		 Sala Sismica INGV-Roma 125546021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2024-02-25 21:03:08 ± 0.15
Latitude 43.5828 ± 0.0081
Longitude 11.0570 ± 0.0050
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 125546021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 825
Semi-minor axis of confidence ellipse (meter) 517
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 189
Circular confidence region, given by single value of horizontal uncertainty (meter) 820.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 167
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.40919
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 4
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 125546021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2024-02-25 21:09:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HLNI.HHZ. 2024-02-25T21:05:04.79 3.0 undecidable manual Pg 18.92 0
IV.SCTE.HHZ. 2024-02-25T21:05:01.28 3.0 positive manual Pg 19.139999 0
IV.IVPL.HHZ. 2024-02-25T21:04:51.77 3.0 undecidable manual Pg 17.969999 0
GU.SATI.HHZ. 2024-02-25T21:04:38.23 3.0 undecidable manual Sn 1.79 0
2Y.A301A.HHZ. 2024-02-25T21:04:15.12 3.0 undecidable manual Sg 0.12 0
GU.SATI.HHZ. 2024-02-25T21:04:00.62 3.0 undecidable manual Pn 2.99 0
IV.ORO.EHZ. 2024-02-25T21:03:53.62 3.0 positive manual Pn -0.86 0
IV.RM33.HNZ. 2024-02-25T21:03:38.21 3.0 undecidable manual Pg -0.05 0
IV.CING.HHZ. 2024-02-25T21:03:30.20 3.0 undecidable manual Pn -3.95 0
IV.PII.HHZ. 2024-02-25T21:03:23.27 0.6 undecidable manual S 290 45.4212 50 -0.46 66
IV.PII.HHZ. 2024-02-25T21:03:17.84 0.3 negative manual P 290 45.4212 50 0.38 100
IV.CSNT.HHZ. 2024-02-25T21:03:17.09 0.6 undecidable manual S 123 22.3554 114 -0.32 70
IV.CRMI.HHZ. 2024-02-25T21:03:17.84 0.6 undecidable manual S 345 24.3534 112 -0.22 72
IV.OSSC.HHZ. 2024-02-25T21:03:15.74 0.6 undecidable manual S 113 16.5723 121 0.12 74
IV.CRMI.HHZ. 2024-02-25T21:03:14.43 0.6 undecidable manual P 345 24.3534 112 0.23 71
IV.CSNT.HHZ. 2024-02-25T21:03:13.75 0.6 positive manual P 123 22.3554 114 -0.07 74
IV.OSSC.HHZ. 2024-02-25T21:03:12.94 0.6 negative manual P 113 16.5723 121 0.15 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.OSSC.HHE. ML:1.1 0.000105 0.22 AML other m 2024-02-25T21:03:16.29
IV.OSSC.HHN. ML:1.0 0.0000975 0.2 AML other m 2024-02-25T21:03:16.53
IV.CRMI.HHN. ML:1.0 0.000058049999999999995 0.54 AML other m 2024-02-25T21:03:18.36
IV.CRMI.HHE. ML:0.8 0.00003395 1 AML other m 2024-02-25T21:03:18.67
IV.PII.HHN. ML:1.0 0.000030595 1.26 AML other m 2024-02-25T21:03:24.73
IV.PII.HHE. ML:1.1 0.00004035 0.42 AML other m 2024-02-25T21:03:26.78
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