Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 30-10-2021 and time 01:30:36 (Italy) in region 6 km S Radicondoli (SI)

A magnitude ML 0.8 earthquake occured in region: 6 km S Radicondoli (SI), on

  • 29-10-2021 23:30:36 (UTC)
  • 30-10-2021 01:30:36 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.2100, 11.0440 at 7 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 6 914 914
Chiusdino SI 7 1903 2817
Montieri GR 9 1204 4021
Castelnuovo di Val di Cecina PI 11 2231 6252
Monticiano SI 14 1571 7823
Casole d'Elsa SI 15 3897 11720
Monterotondo Marittimo GR 17 1371 13091
Sovicille SI 17 10116 23207
Pomarance PI 17 5897 29104

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km W of Siena (53903 inhabitants)
50 Km N of Grosseto (82087 inhabitants)
62 Km S of Scandicci (50609 inhabitants)
65 Km S of Firenze (382808 inhabitants)
71 Km SE of Livorno (159219 inhabitants)
74 Km W of Arezzo (99543 inhabitants)
75 Km S of Prato (191150 inhabitants)
77 Km SE of Pisa (89158 inhabitants)
81 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 0.8 2021-10-29
23:30:36		 43.2097 11.0443 7 2021-10-29
23:35:57		 Sala Sismica INGV-Roma 97074951
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-29 23:30:36 ± 0.14
Latitude 43.2097 ± 0.0090
Longitude 11.0443 ± 0.0123
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97074951

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 958
Semi-minor axis of confidence ellipse (meter) 715
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 136
Circular confidence region, given by single value of horizontal uncertainty (meter) 960.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.42
Epicentral distance of station closest to the epicenter (degree) 0.08184
Epicentral distance of station farthest from the epicenter (degree) 0.76532
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 97074951
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-29 23:35:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CELB.HHZ. 2021-10-29T23:30:52.01 0.3 undecidable manual P 233 84.9483 50 1.01 50
IV.CASP.HHZ. 2021-10-29T23:30:51.00 0.6 undecidable manual S 197 48.7179 50 -1.3 31
IV.OSSC.HHZ. 2021-10-29T23:30:49.17 0.6 undecidable manual S 25 38.4282 50 -0.39 46
IV.CSNT.HHZ. 2021-10-29T23:30:47.99 0.6 undecidable manual S 34 35.3424 102 -0.52 45
IV.MAGO.CHN. 2021-10-29T23:30:46.66 0.6 undecidable manual S 283 32.0457 103 -0.73 42
IV.CASP.HHZ. 2021-10-29T23:30:45.67 0.3 undecidable manual P 197 48.7179 50 0.26 70
IV.RIBO.EHZ.01 2021-10-29T23:30:45.35 0.6 undecidable manual S 180 28.9488 104 -1 37
IV.OSSC.HHZ. 2021-10-29T23:30:43.91 0.3 undecidable manual P 25 38.4282 50 0.08 74
IV.CSNT.HHZ. 2021-10-29T23:30:43.35 0.1 undecidable manual P 34 35.3424 102 0.13 98
IV.RIBO.EHZ.01 2021-10-29T23:30:42.27 0.3 undecidable manual P 180 28.9488 104 0.3 72
IV.MAGO.CHN. 2021-10-29T23:30:42.69 0.3 undecidable manual P 283 32.0457 103 0.11 74
IV.TRIF.CHZ. 2021-10-29T23:30:41.87 0.3 undecidable manual S 227 15.5733 115 -0.09 77
IV.TRIF.CHZ. 2021-10-29T23:30:39.66 0.1 undecidable manual P 227 15.5733 115 0.22 100
IV.FROS.CHZ. 2021-10-29T23:30:39.87 0.3 undecidable manual S 90 9.0798 129 -0.16 77
IV.FROS.CHZ. 2021-10-29T23:30:38.63 0.1 positive manual P 90 9.0798 129 0.31 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:0.9 0.0001215 1.88 AML other m 2021-10-29T23:30:39.96
IV.FROS.CHN. ML:0.9 0.000133 0.68 AML other m 2021-10-29T23:30:40.21
IV.TRIF.CHN. ML:0.7 0.000052249999999999996 0.32 AML other m 2021-10-29T23:30:42.53
IV.TRIF.CHE. ML:0.8 0.00005885 0.16 AML other m 2021-10-29T23:30:42.41
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