Earthquake with magnitude of ML 2.0 on date 04-12-2021 and time 15:45:40 (UTC) in region 6 km S Radicondoli (SI)

A magnitude ML 2.0 earthquake occured in region: 6 km S Radicondoli (SI), on

  • 04-12-2021 15:45:40 (UTC)
  • 04-12-2021 16:45:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.206, 11.038 at 6 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.

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 16 1371 13091
Pomarance PI 17 5897 18988
Sovicille SI 18 10116 29104

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km W of Siena (53903 inhabitants)
50 Km N of Grosseto (82087 inhabitants)
63 Km S of Scandicci (50609 inhabitants)
65 Km S of Firenze (382808 inhabitants)
70 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)
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

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 2.0 2021-12-04
15:45:40
43.2062 11.0375 7 2021-12-04
15:53:31
Sala Sismica INGV-Roma 98135701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-04 15:45:40 ± 0.11
Latitude 43.2062 ± 0.0054
Longitude 11.0375 ± 0.0099
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 98135701

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 614
Semi-minor axis of confidence ellipse (meter) 541
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 301
Circular confidence region, given by single value of horizontal uncertainty (meter) 610
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 35
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.75903
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 12
Magnitude information

ML:2

Field Value
Value 2
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 98135701
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-04 15:53:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
RF.GEPF.HHZ. 2021-12-04T15:47:14.93 3.0 undecidable manual Sn 0.4 0
IV.ESCV.HHZ. 2021-12-04T15:47:10.48 3.0 positive manual Pn -1.38 0
IV.IVGP.HHZ. 2021-12-04T15:47:03.89 3.0 undecidable manual Pn -0.89 0
IX.SCL3.EHZ.02 2021-12-04T15:46:47.10 3.0 negative manual Pn 2.69 0
IV.VIVA.HHZ. 2021-12-04T15:46:46.45 3.0 undecidable manual Sg 6.47 0
IV.MF5.EHZ. 2021-12-04T15:46:40.32 3.0 undecidable manual Sg 4.53 0
IV.CMIS.HHZ. 2021-12-04T15:46:36.20 3.0 negative manual Pn 3.41 0
IV.MOMA.HHZ. 2021-12-04T15:46:21.07 3.0 undecidable manual S -0.41 0
IV.BRSN.EHZ. 2021-12-04T15:46:19.75 3.0 undecidable manual S -3.64 0
IV.TOLF.HHZ. 2021-12-04T15:46:08.20 3.0 positive manual P 2.56 0
IV.CELB.HHZ. 2021-12-04T15:46:06.29 0.3 undecidable manual S 233 0.759 50 -0.02 68
IV.RUFI.EHZ. 2021-12-04T15:46:05.24 0.6 undecidable manual S 28 0.7177 50 0.15 45
IV.FRON.EHZ. 2021-12-04T15:46:03.58 3.0 negative manual P -0.56 0
IV.CRMI.HNE. 2021-12-04T15:46:01.35 0.3 undecidable manual S 356 0.5909 50 0.04 70
IV.CPGN.EHZ. 2021-12-04T15:45:59.80 3.0 undecidable manual P -1.95 0
IV.ARCI.HHZ. 2021-12-04T15:45:57.52 0.6 undecidable manual S 138 0.4775 50 -0.44 44
IV.CELB.HHZ. 2021-12-04T15:45:56.24 0.1 undecidable manual P 233 0.759 50 0.9 70
IV.RUFI.EHZ. 2021-12-04T15:45:55.25 0.1 undecidable manual P 28 0.7177 50 0.62 79
IV.CASP.HHZ. 2021-12-04T15:45:55.53 0.6 undecidable manual S 197 0.4335 50 -1.14 33
IV.OSSC.HHZ. 2021-12-04T15:45:53.71 0.3 undecidable manual S 25 0.3516 99 -0.36 69
IV.MCIV.CHZ. 2021-12-04T15:45:53.56 0.1 undecidable manual P 132 0.6331 50 0.38 87
IV.CSNT.HHZ. 2021-12-04T15:45:52.32 0.3 undecidable manual S 34 0.3238 100 -0.7 62
IV.CRMI.HNE. 2021-12-04T15:45:52.56 0.1 undecidable manual P 356 0.5909 50 0.11 93
IV.MAGO.CHE. 2021-12-04T15:45:50.59 0.6 undecidable manual S 284 0.2842 102 -0.94 38
IV.RIBO.EHZ.01 2021-12-04T15:45:50.20 0.6 undecidable manual S 179 0.2572 103 -0.31 48
IV.ARCI.HHZ. 2021-12-04T15:45:49.61 0.1 undecidable manual P 138 0.4775 50 -0.9 74
IV.CASP.HHZ. 2021-12-04T15:45:49.82 1.0 undecidable manual P 197 0.4335 50 0.05 24
IV.OSSC.HHZ. 2021-12-04T15:45:48.23 0.1 undecidable manual P 25 0.3516 99 -0.04 99
IV.CSNT.HHZ. 2021-12-04T15:45:47.67 0.1 undecidable manual P 34 0.3238 100 0 100
IV.RIBO.EHZ.01 2021-12-04T15:45:46.29 0.1 undecidable manual P 179 0.2572 103 0.08 100
IV.MAGO.CHE. 2021-12-04T15:45:46.77 0.1 undecidable manual P 284 0.2842 102 -0.04 100
IV.TRIF.CHZ. 2021-12-04T15:45:45.87 0.6 undecidable manual S 227 0.134 114 -0.12 51
IV.FROS.CHZ. 2021-12-04T15:45:44.55 0.6 undecidable manual S 88 0.0863 124 0.17 50
IV.FROS.CHZ. 2021-12-04T15:45:43.13 0.1 positive manual P 88 0.0863 124 0.46 95
IV.TRIF.CHZ. 2021-12-04T15:45:43.92 0.1 positive manual P 227 0.134 114 0.32 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHN. ML:2.5 0.005215 1.74 AML other m 2021-12-04T15:45:45.04
IV.TRIF.CHN. ML:2.7 0.00529 0.26 AML other m 2021-12-04T15:45:46.63
IV.TRIF.CHE. ML:2.7 0.00548 0.92 AML other m 2021-12-04T15:45:46.65
IV.FROS.CHE. ML:2.5 0.0057 0.64 AML other m 2021-12-04T15:45:47.09
IV.RIBO.EHN.01 ML:2.2 0.0009435 0.66 AML other m 2021-12-04T15:45:51.46
IV.RIBO.EHE.01 ML:2 0.0005795 0.3 AML other m 2021-12-04T15:45:52.85
IV.CSNT.HHE. ML:1.8 0.0002875 0.42 AML other m 2021-12-04T15:45:53.34
IV.CSNT.HHN. ML:1.7 0.0002175 0.58 AML other m 2021-12-04T15:45:54.52
IV.OSSC.HHN. ML:1.7 0.0001665 1.4 AML other m 2021-12-04T15:45:55.18
IV.CASP.HNN. ML:0 0.000312 0.26 AML other m 2021-12-04T15:45:55.71
IV.CASP.HHN. ML:0 0.000247 0.22 AML other m 2021-12-04T15:45:55.82
IV.OSSC.HHE. ML:1.8 0.0002045 1.1 AML other m 2021-12-04T15:45:56.33
IV.CASP.HHE. ML:0 0.0002775 1.7 AML other m 2021-12-04T15:46:00.10
IV.CASP.HNE. ML:0 0.0003525 1.68 AML other m 2021-12-04T15:46:00.13
IV.RUFI.EHE. ML:1.8 8.475E-5 0.52 AML other m 2021-12-04T15:46:06.42
IV.RUFI.EHN. ML:1.8 9.09E-5 0.44 AML other m 2021-12-04T15:46:07.21
IV.ARCI.HNE. ML:1.5 8.3402835E-5 0.4224 AML other m 2021-12-04T15:46:02.27
IV.ARCI.HNN. ML:1.5 8.69866E-5 0.3328 AML other m 2021-12-04T15:46:01.22
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download