Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 25-12-2021 and time 03:29:19 (UTC) in region 3 km W San Godenzo (FI)

A magnitude ML 0.8 earthquake occured in region: 3 km W San Godenzo (FI), on

  • 25-12-2021 03:29:19 (UTC)
  • 25-12-2021 04:29:19 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9400, 11.5830 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
San Godenzo FI 3 1167 1167
Dicomano FI 7 5515 6682
Londa FI 9 1840 8522
Vicchio FI 9 8044 16566
Rufina FI 15 7346 23912
Marradi FI 15 3139 27051
Borgo San Lorenzo FI 16 18211 45262
Premilcuore FC 16 799 46061
Portico e San Benedetto FC 19 756 46817
Palazzuolo sul Senio FI 20 1154 47971
Pelago FI 20 7660 55631
Pratovecchio Stia AR 20 5845 61476

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km NE of Firenze (382808 inhabitants)
38 Km NE of Scandicci (50609 inhabitants)
39 Km E of Prato (191150 inhabitants)
45 Km SW of Faenza (58541 inhabitants)
47 Km S of Imola (69797 inhabitants)
48 Km SW of Forlì (117913 inhabitants)
53 Km E of Pistoia (90315 inhabitants)
57 Km W of Cesena (96758 inhabitants)
58 Km NW of Arezzo (99543 inhabitants)
65 Km SE of Bologna (386663 inhabitants)
72 Km N of Siena (53903 inhabitants)
72 Km SW of Ravenna (159116 inhabitants)
80 Km W of Rimini (147750 inhabitants)
87 Km E of Lucca (89046 inhabitants)
94 Km SE of Modena (184973 inhabitants)
98 Km E of Pisa (89158 inhabitants)
100 Km S of Ferrara (133155 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 0.8 2021-12-25
03:29:19		 43.94 11.5833 8 2021-12-25
03:44:19		 Sala Sismica INGV-Roma 98940211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-25 03:29:19 ± 0.17
Latitude 43.9400 ± 0.0027
Longitude 11.5833 ± 0.0037
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 98940211

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 318
Semi-minor axis of confidence ellipse (meter) 175
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 31
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 74
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31296
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 98940211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-25 03:44:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IT.ORP.HGZ. 2021-12-25T03:31:18.53 3.0 undecidable manual Sg 13.45 0
OX.FUSE.HHZ. 2021-12-25T03:30:10.88 3.0 undecidable manual Pg 7.65 0
IV.GAVE.EHZ. 2021-12-25T03:29:48.39 3.0 negative manual Pg 0 0
IV.COR1.EHZ. 2021-12-25T03:29:41.26 3.0 undecidable manual Pg 0 0
IV.BRIS.HHE. 2021-12-25T03:29:32.51 0.6 undecidable manual S 25 34.743 103 0.48 44
IV.VISG.HHZ. 2021-12-25T03:29:30.35 0.3 undecidable manual S 337 30.0477 104 -0.09 73
IV.SFI.EHZ. 2021-12-25T03:29:27.56 0.1 undecidable manual S 100 21.4674 110 -0.01 100
IV.SEI.HHZ. 2021-12-25T03:29:27.51 0.3 undecidable manual S 305 21.9669 109 -0.24 72
IV.ASQU.HHZ. 2021-12-25T03:29:27.94 0.3 undecidable manual S 134 22.8549 109 -0.11 73
IV.BOSL.HHZ. 2021-12-25T03:29:26.25 0.3 undecidable manual S 267 16.7721 115 0.19 73
IV.BRIS.HHE. 2021-12-25T03:29:26.78 0.1 undecidable manual P 25 34.743 103 -0.03 97
IV.LMD.HHE. 2021-12-25T03:29:26.47 0.3 undecidable manual S 33 18.1707 113 -0.05 75
IV.VISG.HHZ. 2021-12-25T03:29:25.70 0.1 undecidable manual P 337 30.0477 104 -0.19 95
IV.ASQU.HHZ. 2021-12-25T03:29:24.39 0.1 undecidable manual P 134 22.8549 109 -0.12 98
IV.SFI.EHZ. 2021-12-25T03:29:24.29 0.1 undecidable manual P 100 21.4674 110 0.06 99
IV.RUFI.EHZ. 2021-12-25T03:29:24.71 0.3 undecidable manual S 208 12.7761 121 -0.14 74
IV.SEI.HHZ. 2021-12-25T03:29:24.14 0.1 undecidable manual P 305 21.9669 109 -0.2 96
IV.BOSL.HHZ. 2021-12-25T03:29:23.74 0.1 undecidable manual P 267 16.7721 115 0.38 93
IV.LMD.HHE. 2021-12-25T03:29:23.75 0.1 undecidable manual P 33 18.1707 113 0.12 98
IV.RUFI.EHZ. 2021-12-25T03:29:22.77 0.1 undecidable manual P 208 12.7761 121 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASQU.HHN. ML:0.9 0.000056099999999999995 0.2 AML other m 2021-12-25T03:29:28.09
IV.ASQU.HHE. ML:1.2 0.000121 0.24 AML other m 2021-12-25T03:29:28.09
IV.RUFI.EHE. ML:0.6 0.000048083589999999994 0.1392 AML other m 2021-12-25T03:29:24.88
IV.RUFI.EHN. ML:0.7 0.000059082925 0.4 AML other m 2021-12-25T03:29:25.53
IV.BOSL.HHE. ML:0.0 0.000008466228499999998 0.3216 AML other m 2021-12-25T03:29:29.24
IV.BOSL.HHN. ML:0.0 0.0000102257985 0.1408 AML other m 2021-12-25T03:29:26.70
IV.SEI.HHE. ML:0.8 0.00004757292000000001 0.4 AML other m 2021-12-25T03:29:32.13
IV.SEI.HHN. ML:1.2 0.00010068111 0.24 AML other m 2021-12-25T03:29:28.41
IV.SFI.EHE. ML:0.8 0.000047526650000000003 0.08 AML other m 2021-12-25T03:29:28.23
IV.SFI.EHN. ML:0.8 0.000047052265 0.0992 AML other m 2021-12-25T03:29:28.45
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