Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 30-08-2021 and time 06:23:57 (UTC) in region 3 km E Castelfiorentino (FI)

A magnitude ML 1.2 earthquake occured in region: 3 km E Castelfiorentino (FI), on

  • 30-08-2021 06:23:57 (UTC)
  • 30-08-2021 08:23:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6030, 11.0140 at 9 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
Castelfiorentino FI 3 17504 17504
Certaldo FI 7 16121 33625
Montespertoli FI 7 13537 47162
Gambassi Terme FI 9 4870 52032
Montaione FI 10 3700 55732
Tavarnelle Val di Pesa FI 14 7800 63532
Empoli FI 14 48109 111641
Montelupo Fiorentino FI 14 14098 125739
Barberino Val d'Elsa FI 14 4386 130125
San Casciano in Val di Pesa FI 15 17062 147187
San Gimignano SI 15 7820 155007
San Miniato PI 16 27934 182941
Capraia e Limite FI 16 7670 190611
Poggibonsi SI 19 29196 219807
Palaia PI 19 4612 224419

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SW of Scandicci (50609 inhabitants)
27 Km SW of Firenze (382808 inhabitants)
32 Km S of Prato (191150 inhabitants)
38 Km S of Pistoia (90315 inhabitants)
41 Km NW of Siena (53903 inhabitants)
49 Km SE of Lucca (89046 inhabitants)
51 Km E of Pisa (89158 inhabitants)
57 Km E of Livorno (159219 inhabitants)
68 Km E of Viareggio (62467 inhabitants)
72 Km W of Arezzo (99543 inhabitants)
85 Km SE of Massa (69479 inhabitants)
91 Km SE of Carrara (63133 inhabitants)
94 Km N of Grosseto (82087 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 		ML 1.2 2021-08-30
06:23:57		 43.6032 11.014 9 2021-12-29
11:12:27		 Bollettino Sismico Italiano INGV 95162701
Reviewed
Rev100 		ML 1.2 2021-08-30
06:23:57		 43.605 10.9888 10 2021-08-30
06:58:31		 Sala Sismica INGV-Roma 94811391
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-30 06:23:57 ± 0.09
Latitude 43.6032 ± 0.0036
Longitude 11.0140 ± 0.0075
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95162701

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 505
Semi-minor axis of confidence ellipse (meter) 350
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 85
Circular confidence region, given by single value of horizontal uncertainty (meter) 500.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.54949
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 95162701
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-14 14:31:54

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 94811391
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-30 06:58:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
ST.CARE.HNZ. 2021-08-30T06:25:18.26 3.0 undecidable manual Sn 0.3 0
IV.PCN.EHZ. 2021-08-30T06:24:55.40 3.0 undecidable manual Sg 5.35 0
ST.CARE.HNZ. 2021-08-30T06:24:49.01 3.0 negative manual Pg 6.64 0
IV.IMOL.EHZ. 2021-08-30T06:24:30.17 3.0 undecidable manual S -0.57 0
IV.MAGO.CHE. 2021-08-30T06:24:12.57 0.3 undecidable manual S 218 46.5201 50 -0.01 73
IV.MOCL.EHZ. 2021-08-30T06:24:12.73 0.6 undecidable manual S 17 46.5201 50 0.14 47
IV.RUFI.EHZ. 2021-08-30T06:24:12.47 0.6 undecidable manual S 57 47.5191 50 -0.38 45
IV.FROS.CHZ. 2021-08-30T06:24:11.51 0.6 undecidable manual S 165 45.1215 50 -0.7 41
IV.MPPT.EHN. 2021-08-30T06:24:10.23 0.6 undecidable manual S 9 39.8268 50 -0.56 43
IV.BDI.HHZ. 2021-08-30T06:24:08.49 0.3 undecidable manual P 327 60.9945 50 0.14 69
IV.SEI.HHZ. 2021-08-30T06:24:08.18 0.3 undecidable manual P 29 57.0984 50 0.43 65
GU.POPM.HHE. 2021-08-30T06:24:07.29 0.3 undecidable manual P 337 53.2023 50 0.15 70
GU.MAIM.HHZ. 2021-08-30T06:24:07.19 0.3 undecidable manual P 310 54.2013 50 -0.1 70
IV.FROS.CHZ. 2021-08-30T06:24:06.01 0.1 undecidable manual P 165 45.1215 50 0.11 95
IV.MOCL.EHZ. 2021-08-30T06:24:06.36 0.3 undecidable manual P 17 46.5201 50 0.24 69
IV.RUFI.EHZ. 2021-08-30T06:24:06.43 0.3 undecidable manual P 57 47.5191 50 0.16 70
IV.MAGO.CHE. 2021-08-30T06:24:06.20 0.3 undecidable manual P 218 46.5201 50 0.09 72
IV.BOSL.HHZ. 2021-08-30T06:24:06.15 0.3 undecidable manual P 38 46.4202 50 0.05 72
IV.CSNT.HHZ. 2021-08-30T06:24:06.68 0.6 undecidable manual S 123 26.4513 109 -0.31 47
IV.OSSC.HHZ. 2021-08-30T06:24:05.35 0.3 undecidable manual S 115 20.5683 114 0.26 72
IV.MPPT.EHN. 2021-08-30T06:24:05.08 0.3 undecidable manual P 9 39.8268 50 0 74
IV.CRMI.HHZ. 2021-08-30T06:24:04.91 0.6 undecidable manual S 353 21.5673 113 -0.48 46
IV.CSNT.HHZ. 2021-08-30T06:24:02.70 0.1 undecidable manual P 123 26.4513 109 -0.18 97
IV.CRMI.HHZ. 2021-08-30T06:24:01.88 0.1 undecidable manual P 353 21.5673 113 -0.08 100
IV.OSSC.HHZ. 2021-08-30T06:24:01.95 0.1 undecidable manual P 115 20.5683 114 0.16 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRMI.HHN. ML:1.2 0.00011649999999999999 0.46 AML other m 2021-08-30T06:24:05.32
IV.CRMI.HHE. ML:1.1 0.0000965 0.56 AML other m 2021-08-30T06:24:05.05
IV.OSSC.HHN. ML:1.1 0.00008685 0.18 AML other m 2021-08-30T06:24:06.07
IV.OSSC.HHE. ML:1.2 0.0001295 0.54 AML other m 2021-08-30T06:24:06.20
IV.CSNT.HHN. ML:0.9 0.00004725 0.7 AML other m 2021-08-30T06:24:06.41
IV.CSNT.HHE. ML:0.9 0.000046049999999999994 1.4 AML other m 2021-08-30T06:24:07.92
IV.PII.HHN. ML:1.5 0.0001075 0.28 AML other m 2021-08-30T06:24:09.19
IV.PII.HHE. ML:1.4 0.00008774999999999999 0.24 AML other m 2021-08-30T06:24:09.87
IV.FROS.CHE. ML:1.6 0.00010664999999999999 1.26 AML other m 2021-08-30T06:24:12.15
IV.FROS.CHN. ML:1.6 0.0001035 1.8 AML other m 2021-08-30T06:24:12.06
IV.BOSL.HHN. ML:1.0 0.000029749999999999998 1.74 AML other m 2021-08-30T06:24:13.02
IV.BOSL.HHE. ML:0.7 0.0000158 1.42 AML other m 2021-08-30T06:24:14.02
IV.SEI.HHE. ML:1.3 0.000039649999999999995 0.34 AML other m 2021-08-30T06:24:18.79
IV.BDI.HHE. ML:1.1 0.0000233 0.88 AML other m 2021-08-30T06:24:19.64
IV.SEI.HHN. ML:1.4 0.00005355 0.42 AML other m 2021-08-30T06:24:21.14
IV.BDI.HHN. ML:1.0 0.0000197 1.14 AML other m 2021-08-30T06:24:21.92
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