Earthquake with magnitude of ML 1.6 on date 16-11-2021 and time 14:29:30 (UTC) in region 4 km NW Chiusdino (SI)

A magnitude ML 1.6 earthquake occured in region: 4 km NW Chiusdino (SI), on

  • 16-11-2021 14:29:30 (UTC)
  • 16-11-2021 15:29:30 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.18, 11.053 at 9 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
Chiusdino SI 4 1903 1903
Montieri GR 6 1204 3107
Radicondoli SI 9 914 4021
Monticiano SI 11 1571 5592
Castelnuovo di Val di Cecina PI 12 2231 7823
Monterotondo Marittimo GR 16 1371 9194
Casole d'Elsa SI 18 3897 13091
Sovicille SI 18 10116 23207
Massa Marittima GR 20 8375 31582
Pomarance PI 20 5897 37479

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km SW of Siena (53903 inhabitants)
47 Km N of Grosseto (82087 inhabitants)
65 Km S of Scandicci (50609 inhabitants)
68 Km S of Firenze (382808 inhabitants)
73 Km SE of Livorno (159219 inhabitants)
74 Km W of Arezzo (99543 inhabitants)
78 Km S of Prato (191150 inhabitants)
80 Km SE of Pisa (89158 inhabitants)
85 Km S of Pistoia (90315 inhabitants)
86 Km SE of Lucca (89046 inhabitants)
Recent and historical seismicity
Seismic hazard
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 1.6 2021-11-16
14:29:30
43.1797 11.0532 9 2021-11-16
15:22:43
Sala Sismica INGV-Roma 97493961
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-16 14:29:30 ± 0.48
Latitude 43.1797 ± 0.0369
Longitude 11.0532 ± 0.0284
Depth (km) 9 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97493961

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 4500
Semi-minor axis of confidence ellipse (meter) 1143
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 334
Circular confidence region, given by single value of horizontal uncertainty (meter) 4500
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 189
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.44966
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.7
Num. used stations 12
Type of magnitude ML
Reference to an origin 97493961
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-16 15:22:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
TV.GMB1.HHZ. 2021-11-16T14:31:21.96 3.0 positive manual Pg 21.59 0
IV.VTIR.HHZ. 2021-11-16T14:31:21.64 3.0 undecidable manual Sg 14.46 0
IT.ORP.HGZ. 2021-11-16T14:31:15.92 3.0 undecidable manual Sn 4.92 0
IV.CFMN.HHZ. 2021-11-16T14:31:14.07 3.0 undecidable manual Sg 11.43 0
IV.SPS2.HHZ. 2021-11-16T14:31:03.90 3.0 positive manual Pg 12.32 0
CR.ZAG.BHZ. 2021-11-16T14:30:46.22 3.0 undecidable manual Pg 15.98 0
OT.OT17.EHZ. 2021-11-16T14:30:32.06 3.0 negative manual Pg 9.5 0
IV.GATE.HHZ. 2021-11-16T14:30:31.92 3.0 positive manual Pg 12.02 0
IX.NSC3.EHZ.02 2021-11-16T14:30:31.33 3.0 undecidable manual Pn 3.96 0
IV.APPI.EHZ. 2021-11-16T14:30:21.02 3.0 positive manual Pg 8.12 0
IT.PLTA.HNZ. 2021-11-16T14:30:15.33 3.0 undecidable manual Pn -0.71 0
IV.ATFO.HHZ. 2021-11-16T14:30:06.35 3.0 undecidable manual S 1.44 0
IV.MSSA.HHZ. 2021-11-16T14:29:51.46 3.0 negative manual P 1.01 0
IV.CASP.HHZ. 2021-11-16T14:29:44.65 0.1 undecidable manual S 200 0.4119 50 -0.69 80
IV.ARCI.HHZ. 2021-11-16T14:29:39.63 0.3 undecidable manual P 137 0.4497 50 0 71
IV.CASP.HHZ. 2021-11-16T14:29:39.52 0.1 undecidable manual P 200 0.4119 50 0.54 84
IV.RIBO.EHZ.01 2021-11-16T14:29:36.16 0.1 undecidable manual P 181 0.2302 110 0.39 91
IV.TRIF.CHZ. 2021-11-16T14:29:35.86 0.3 undecidable manual S 239 0.1277 124 -0.34 70
IV.FROS.CHZ. 2021-11-16T14:29:34.39 0.3 undecidable manual S 68 0.0809 136 -0.43 70
IV.TRIF.CHZ. 2021-11-16T14:29:33.91 0.1 negative manual P 239 0.1277 124 0.2 97
IT.FIE.HGZ. 2021-11-16T14:29:33.49 3.0 negative manual P -0.34 0
IV.FROS.CHZ. 2021-11-16T14:29:32.98 0.1 negative manual P 68 0.0809 136 0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:1.5 0.0004785 0.66 AML other m 2021-11-16T14:29:34.40
IV.FROS.CHN. ML:1.4 0.000356 0.66 AML other m 2021-11-16T14:29:34.52
IV.TRIF.CHN. ML:1.3 0.000215 1.36 AML other m 2021-11-16T14:29:35.93
IV.TRIF.CHE. ML:1.3 0.0001865 0.54 AML other m 2021-11-16T14:29:36.37
IT.FIE.HGE. ML:4.6 0.06295 1.08 AML other m 2021-11-16T14:29:42.76
IT.FIE.HGN. ML:4.5 0.0559 0.02 AML other m 2021-11-16T14:29:43.05
IV.CASP.HHE. ML:1.1 3.545E-5 1.34 AML other m 2021-11-16T14:29:45.73
IV.CASP.HHN. ML:1 3.075E-5 0.96 AML other m 2021-11-16T14:29:45.38
IV.RIBO.EHE.01 ML:1.6 0.00022265 0.82 AML other m 2021-11-16T14:29:46.16
IV.RIBO.EHN.01 ML:1.7 0.000276 1.58 AML other m 2021-11-16T14:29:49.86
IV.MSSA.HHE. ML:2.9 0.000306 0.78 AML other m 2021-11-16T14:30:39.73
IV.MSSA.HHN. ML:2.8 0.000238 0.96 AML other m 2021-11-16T14:30:39.91
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