Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 23-03-2024 and time 01:45:38 (Italy) in region 2 km NW Certaldo (FI)

A magnitude ML 0.9 earthquake occured in region: 2 km NW Certaldo (FI), on

  • 23-03-2024 00:45:38 (UTC)
  • 23-03-2024 01:45:38 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.5600, 11.0280 at 8 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 2 16121 16121
Gambassi Terme FI 6 4870 20991
Castelfiorentino FI 7 17504 38495
Montaione FI 9 3700 42195
Montespertoli FI 10 13537 55732
San Gimignano SI 10 7820 63552
Tavarnelle Val di Pesa FI 12 7800 71352
Barberino Val d'Elsa FI 12 4386 75738
Poggibonsi SI 14 29196 104934
San Casciano in Val di Pesa FI 17 17062 121996
Colle di Val d'Elsa SI 17 21620 143616
Empoli FI 19 48109 191725
Montelupo Fiorentino FI 19 14098 205823
San Miniato PI 19 27934 233757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km SW of Scandicci (50609 inhabitants)
30 Km SW of Firenze (382808 inhabitants)
36 Km S of Prato (191150 inhabitants)
36 Km NW of Siena (53903 inhabitants)
43 Km S of Pistoia (90315 inhabitants)
53 Km SE of Lucca (89046 inhabitants)
53 Km E of Pisa (89158 inhabitants)
58 Km E of Livorno (159219 inhabitants)
70 Km W of Arezzo (99543 inhabitants)
71 Km E of Viareggio (62467 inhabitants)
89 Km SE of Massa (69479 inhabitants)
89 Km N of Grosseto (82087 inhabitants)
94 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 0.9 2024-03-23
00:45:38		 43.5603 11.028 8 2024-03-23
01:09:58		 Sala Sismica INGV-Roma 126070591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2024-03-23 00:45:38 ± 0.16
Latitude 43.5603 ± 0.0126
Longitude 11.0280 ± 0.0261
Depth (km) 8 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 126070591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2400
Semi-minor axis of confidence ellipse (meter) 490
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 59
Circular confidence region, given by single value of horizontal uncertainty (meter) 2400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 111
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) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.16188
Epicentral distance of station farthest from the epicenter (degree) 0.45416
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:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 126070591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2024-03-23 01:09:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TRIF.CHE. 2024-03-23T00:45:55.01 0.1 undecidable manual S 192 50.4162 50 -0.1 97
IV.PII.HHZ. 2024-03-23T00:45:53.07 0.1 undecidable manual S 294 44.2224 50 -0.37 93
IV.FROS.CHN. 2024-03-23T00:45:51.90 0.1 undecidable manual S 165 40.2264 50 -0.49 91
IV.LOCA.HHZ. 2024-03-23T00:45:50.10 0.1 undecidable manual S 146 33.9438 103 -0.53 90
IV.TRIF.CHE. 2024-03-23T00:45:48.67 0.1 undecidable manual P 192 50.4162 50 0.56 87
IV.CSNT.HHZ. 2024-03-23T00:45:47.01 0.3 undecidable manual S 115 23.1546 109 -0.06 77
IV.PII.HHZ. 2024-03-23T00:45:47.70 0.1 undecidable manual P 294 44.2224 50 0.56 88
IV.CRMI.HHZ. 2024-03-23T00:45:47.70 0.1 undecidable manual S 352 26.3514 107 -0.41 95
IV.FROS.CHN. 2024-03-23T00:45:46.81 0.1 undecidable manual P 165 40.2264 50 0.28 96
IV.OSSC.HHZ. 2024-03-23T00:45:45.63 0.3 undecidable manual S 103 17.9709 114 0.25 75
IV.LOCA.HHZ. 2024-03-23T00:45:45.64 0.1 undecidable manual P 146 33.9438 103 0.12 100
IV.CRMI.HHZ. 2024-03-23T00:45:44.28 1.0 undecidable manual P 352 26.3514 107 0.22 25
IV.CSNT.HHZ. 2024-03-23T00:45:43.56 0.6 positive manual P 115 23.1546 109 0.1 51
IV.OSSC.HHZ. 2024-03-23T00:45:42.74 0.6 negative manual P 103 17.9709 114 0.25 50
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.OSSC.HHE. ML:1.1 0.00011625 1.2 AML other m 2024-03-23T00:45:45.08
IV.OSSC.HHN. ML:1.1 0.000104 0.2 AML other m 2024-03-23T00:45:46.33
IV.CSNT.HHE. ML:0.7 0.00003545 0.58 AML other m 2024-03-23T00:45:46.68
IV.CRMI.HHN. ML:1.0 0.000052900000000000005 0.28 AML other m 2024-03-23T00:45:47.99
IV.CSNT.HHN. ML:0.8 0.000041099999999999996 0.54 AML other m 2024-03-23T00:45:48.16
IV.CRMI.HHE. ML:0.8 0.00003455 0.5 AML other m 2024-03-23T00:45:48.68
IV.LOCA.HHE. ML:0.9 0.000037 0.54 AML other m 2024-03-23T00:45:51.34
IV.LOCA.HHN. ML:1.0 0.00004 0.7 AML other m 2024-03-23T00:45:52.14
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