Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 09-07-2021 and time 20:46:44 (Italy) in region 2 km NE Gambassi Terme (FI)

A magnitude ML 1.2 earthquake occured in region: 2 km NE Gambassi Terme (FI), on

  • 09-07-2021 18:46:44 (UTC)
  • 09-07-2021 20:46:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.5520, 10.9800 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Gambassi Terme FI 3 4870 4870
Certaldo FI 5 16121 20991
Montaione FI 5 3700 24691
Castelfiorentino FI 6 17504 42195
San Gimignano SI 11 7820 50015
Montespertoli FI 13 13537 63552
Barberino Val d'Elsa FI 16 4386 67938
Tavarnelle Val di Pesa FI 16 7800 75738
Poggibonsi SI 17 29196 104934
San Miniato PI 18 27934 132868
Palaia PI 18 4612 137480
Colle di Val d'Elsa SI 18 21620 159100
Empoli FI 19 48109 207209
Volterra PI 19 10519 217728

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km SW of Scandicci (50609 inhabitants)
33 Km SW of Firenze (382808 inhabitants)
38 Km S of Prato (191150 inhabitants)
39 Km NW of Siena (53903 inhabitants)
43 Km S of Pistoia (90315 inhabitants)
50 Km E of Pisa (89158 inhabitants)
50 Km SE of Lucca (89046 inhabitants)
54 Km E of Livorno (159219 inhabitants)
68 Km SE of Viareggio (62467 inhabitants)
74 Km W of Arezzo (99543 inhabitants)
86 Km SE of Massa (69479 inhabitants)
89 Km N of Grosseto (82087 inhabitants)
92 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
Bulletin
Rev1000 		ML 1.2 2021-07-09
18:46:44		 43.5518 10.9795 9 2021-12-29
11:12:12		 Bollettino Sismico Italiano INGV 92955141
Reviewed
Rev100 		ML 1.2 2021-07-09
18:46:44		 43.5508 10.9802 9 2021-07-09
18:54:02		 Sala Sismica INGV-Roma 92517651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-09 18:46:44 ± 0.09
Latitude 43.5518 ± 0.0036
Longitude 10.9795 ± 0.0074
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 92955141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 521
Semi-minor axis of confidence ellipse (meter) 307
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 77
Circular confidence region, given by single value of horizontal uncertainty (meter) 520.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 77
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.19515
Epicentral distance of station farthest from the epicenter (degree) 0.58096
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 92955141
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-07-19 13:19:02

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 92517651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-09 18:54:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.BDI.HHZ. 2021-07-09T18:47:05.03 0.6 undecidable manual S 332 64.491 50 0.25 45
IV.RUFI.EHZ. 2021-07-09T18:47:01.62 0.6 undecidable manual S 53 53.0025 50 -0.12 47
IV.TRIF.CHZ. 2021-07-09T18:47:00.23 0.3 undecidable manual S 187 48.9177 50 -0.4 67
IV.MPPT.EHZ. 2021-07-09T18:46:59.57 0.1 undecidable manual S 11 45.8208 50 -0.25 93
IV.MAGO.CHZ. 2021-07-09T18:46:58.24 0.6 undecidable manual S 220 40.3263 50 -0.1 48
IV.FROS.CHZ. 2021-07-09T18:46:57.92 0.6 undecidable manual S 159 40.5261 50 -0.47 45
IV.BDI.HHZ. 2021-07-09T18:46:56.82 0.6 negative manual P 332 64.491 50 0.51 42
IV.CRMI.HHZ. 2021-07-09T18:46:54.22 0.1 undecidable manual S 360 27.0507 109 -0.44 92
IV.TRIF.CHZ. 2021-07-09T18:46:54.02 0.1 undecidable manual P 187 48.9177 50 0.12 95
IV.RUFI.EHZ. 2021-07-09T18:46:54.90 0.1 undecidable manual P 53 53.0025 50 0.35 89
IV.CSNT.HHZ. 2021-07-09T18:46:54.15 0.6 undecidable manual S 109 26.4513 109 -0.33 47
IV.OSSC.HHZ. 2021-07-09T18:46:53.03 0.1 undecidable manual S 98 21.6672 113 0.12 99
IV.MPPT.EHZ. 2021-07-09T18:46:53.60 0.1 undecidable manual P 11 45.8208 50 0.16 94
IV.FROS.CHZ. 2021-07-09T18:46:52.72 0.1 undecidable manual P 159 40.5261 50 0.1 96
IV.MAGO.CHZ. 2021-07-09T18:46:52.78 0.1 undecidable manual P 220 40.3263 50 0.19 95
IV.PII.HHZ. 2021-07-09T18:46:52.58 0.1 undecidable manual P 297 41.1255 50 -0.13 96
IV.CSNT.HHZ. 2021-07-09T18:46:50.32 0.1 undecidable manual P 109 26.4513 109 -0.04 100
IV.CRMI.HHZ. 2021-07-09T18:46:50.54 0.1 undecidable manual P 360 27.0507 109 0.07 99
IV.OSSC.HHZ. 2021-07-09T18:46:49.62 0.1 undecidable manual P 98 21.6672 113 0.16 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PII.HHE. ML:1.0 0.00003521554 1.7312 AML other m 2021-07-09T18:46:52.02
IV.OSSC.HHN. ML:0.9 0.00006242011 0.2432 AML other m 2021-07-09T18:46:53.25
IV.OSSC.HHE. ML:1.4 0.0001575 0.26 AML other m 2021-07-09T18:46:53.37
IV.CRMI.HHN. ML:0.9 0.000044357245000000006 0.1152 AML other m 2021-07-09T18:46:54.42
IV.CRMI.HHE. ML:0.7 0.000032010145 0.0768 AML other m 2021-07-09T18:46:54.48
IV.CSNT.HHE. ML:0.9 0.00004276337 0.1024 AML other m 2021-07-09T18:46:54.62
IV.CSNT.HHN. ML:0.9 0.00004188145 0.1408 AML other m 2021-07-09T18:46:54.69
IV.CRMI.HNN. ML:1.5 0.00017730764999999998 1.2704 AML other m 2021-07-09T18:46:57.02
IV.FROS.CHE. ML:1.4 0.00007965755 0.2304 AML other m 2021-07-09T18:46:58.84
IV.FROS.CHN. ML:1.5 0.000102392785 0.128 AML other m 2021-07-09T18:46:59.30
IV.CRMI.HNE. ML:1.2 0.00009433821 0.64 AML other m 2021-07-09T18:46:59.58
IV.PII.HHN. ML:1.0 0.000032955415 0.3456 AML other m 2021-07-09T18:47:00.67
IV.BDI.HHN. ML:1.1 0.00002539301 0.384 AML other m 2021-07-09T18:47:05.10
IV.BDI.HHE. ML:1.0 0.000019027635 1.6416 AML other m 2021-07-09T18:47:07.15
IV.BDI.HNE. ML:1.8 0.000108321265 0.64 AML other m 2021-07-09T18:47:07.53
IV.RUFI.EHN. ML:1.1 0.00003071293 0.1056 AML other m 2021-07-09T18:47:09.34
IV.BDI.HNN. ML:2.0 0.00017555159999999996 0.6688 AML other m 2021-07-09T18:47:10.14
IV.RUFI.EHE. ML:1.3 0.000044455229999999996 0.3936 AML other m 2021-07-09T18:47:11.55
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