Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 30-12-2021 and time 22:21:02 (Italy) in region 7 km S Radicondoli (SI)

A magnitude ML 1.0 earthquake occured in region: 7 km S Radicondoli (SI), on

  • 30-12-2021 21:21:02 (UTC)
  • 30-12-2021 22:21:02 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.2030, 11.0240 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
Radicondoli SI 7 914 914
Chiusdino SI 8 1903 2817
Montieri GR 8 1204 4021
Castelnuovo di Val di Cecina PI 10 2231 6252
Monticiano SI 15 1571 7823
Monterotondo Marittimo GR 15 1371 9194
Casole d'Elsa SI 16 3897 13091
Pomarance PI 16 5897 18988
Sovicille SI 19 10116 29104

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km W of Siena (53903 inhabitants)
50 Km N of Grosseto (82087 inhabitants)
63 Km S of Scandicci (50609 inhabitants)
66 Km S of Firenze (382808 inhabitants)
70 Km SE of Livorno (159219 inhabitants)
76 Km W of Arezzo (99543 inhabitants)
76 Km S of Prato (191150 inhabitants)
76 Km SE of Pisa (89158 inhabitants)
82 Km S of Pistoia (90315 inhabitants)
83 Km SE of Lucca (89046 inhabitants)
97 Km SE of Viareggio (62467 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 2021-12-30
21:21:02		 43.2033 11.0235 8 2021-12-30
21:27:33		 Sala Sismica INGV-Roma 99170771
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-30 21:21:02 ± 0.1
Latitude 43.2033 ± 0.0063
Longitude 11.0235 ± 0.0086
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 99170771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 705
Semi-minor axis of confidence ellipse (meter) 465
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 315
Circular confidence region, given by single value of horizontal uncertainty (meter) 700.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 72
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.59265
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 99170771
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-30 21:27:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRMI.HNE. 2021-12-30T21:21:23.51 0.6 undecidable manual S 357 65.7897 50 0.61 39
IV.ARCI.HHZ. 2021-12-30T21:21:19.40 0.6 undecidable manual S 137 53.502 50 -0.22 45
IV.CASP.HHZ. 2021-12-30T21:21:17.37 0.6 undecidable manual S 196 47.5191 50 -0.65 40
IV.PII.HHZ. 2021-12-30T21:21:16.04 3.0 positive manual P 0.68 0
IV.OSSC.HHZ. 2021-12-30T21:21:15.24 0.6 undecidable manual S 27 39.8268 50 -0.71 40
IV.CSNT.HHZ. 2021-12-30T21:21:14.70 0.6 undecidable manual S 36 36.8298 50 -0.47 44
IV.CRMI.HNE. 2021-12-30T21:21:14.59 0.1 undecidable manual P 357 65.7897 50 0.43 84
IV.MAGO.CHE. 2021-12-30T21:21:12.74 0.3 undecidable manual S 285 30.5472 105 -0.48 66
IV.ARCI.HHZ. 2021-12-30T21:21:12.90 0.6 undecidable manual P 137 53.502 50 0.63 40
IV.CASP.HHZ. 2021-12-30T21:21:11.64 0.3 negative manual P 196 47.5191 50 0.29 67
IV.OSSC.HHZ. 2021-12-30T21:21:10.21 0.6 undecidable manual P 27 39.8268 50 0.05 47
IV.CSNT.HHZ. 2021-12-30T21:21:09.65 0.1 positive manual P 36 36.8298 50 -0.06 95
IV.RIBO.EHZ.01 2021-12-30T21:21:08.20 1.0 undecidable manual P 176 28.2495 106 0.06 24
IV.MAGO.CHE. 2021-12-30T21:21:08.67 0.1 undecidable manual P 285 30.5472 105 0.09 96
IV.TRIF.CHZ. 2021-12-30T21:21:07.60 0.6 undecidable manual S 225 13.875 121 -0.23 48
IV.FROS.CHZ. 2021-12-30T21:21:06.70 0.6 undecidable manual S 86 10.7781 127 -0.24 48
IV.FROS.CHZ. 2021-12-30T21:21:05.00 0.1 positive manual P 86 10.7781 127 0.05 100
IV.TRIF.CHZ. 2021-12-30T21:21:05.73 0.1 positive manual P 225 13.875 121 0.25 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHE. ML:1.1 0.00004634219 0.2176 AML other m 2021-12-30T21:21:15.22
IV.CSNT.HHN. ML:1.0 0.000038878159999999994 0.2816 AML other m 2021-12-30T21:21:14.97
IV.OSSC.HHE. ML:1.1 0.00003832011000000001 0.5504 AML other m 2021-12-30T21:21:19.83
IV.OSSC.HHN. ML:1.0 0.000032826434 0.1024 AML other m 2021-12-30T21:21:16.90
IV.CASP.HHE. ML:1.3 0.00005758148 0.2048 AML other m 2021-12-30T21:21:21.78
IV.CASP.HHN. ML:1.2 0.000039946495 0.2176 AML other m 2021-12-30T21:21:17.36
IV.ARCI.HHE. ML:0.8 0.0000162097 0.1536 AML other m 2021-12-30T21:21:20.72
IV.ARCI.HHN. ML:0.8 0.000017402204000000002 0.32 AML other m 2021-12-30T21:21:23.08
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