Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 29-11-2021 and time 08:51:30 (UTC) in region 2 km N Cetona (SI)

A magnitude ML 1.8 earthquake occured in region: 2 km N Cetona (SI), on

  • 29-11-2021 08:51:30 (UTC)
  • 29-11-2021 09:51:30 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9790, 11.9050 at 5 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Cetona SI 2 2755 2755
Sarteano SI 3 4717 7472
Chiusi SI 6 8704 16176
Città della Pieve PG 9 7712 23888
Chianciano Terme SI 11 7105 30993
San Casciano dei Bagni SI 12 1632 32625
Monteleone d'Orvieto TR 14 1467 34092
Paciano PG 14 975 35067
Radicofani SI 14 1097 36164
Piegaro PG 15 3669 39833
Fabro TR 16 2876 42709
Montepulciano SI 16 14097 56806
Montegabbione TR 17 1216 58022
Panicale PG 17 5692 63714
Allerona TR 19 1794 65508

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km W of Perugia (166134 inhabitants)
54 Km S of Arezzo (99543 inhabitants)
60 Km SE of Siena (53903 inhabitants)
65 Km N of Viterbo (67173 inhabitants)
65 Km W of Foligno (57155 inhabitants)
69 Km E of Grosseto (82087 inhabitants)
76 Km NW of Terni (111501 inhabitants)
99 Km N of Civitavecchia (52991 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
Bulletin
Rev1000 		ML 1.8 2021-11-29
08:51:30		 42.9792 11.905 5 2022-03-30
13:04:31		 Bollettino Sismico Italiano INGV 99870261
Reviewed
Rev100 		ML 1.8 2021-11-29
08:51:31		 42.9395 11.9385 12 2021-11-29
08:58:01		 Sala Sismica INGV-Roma 97934131
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-29 08:51:30 ± 0.11
Latitude 42.9792 ± 0.0063
Longitude 11.9050 ± 0.0074
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99870261

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 726
Semi-minor axis of confidence ellipse (meter) 365
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 309
Circular confidence region, given by single value of horizontal uncertainty (meter) 730.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.66640
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 97934131
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-29 08:58:01

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 99870261
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-17 03:15:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FIR.HHZ. 2021-11-29T08:52:03.65 3.0 undecidable manual S -1.32 0
IV.RIBO.EHZ.01 2021-11-29T08:51:52.51 3.0 undecidable manual S -2.56 0
IV.ASSB.HHN. 2021-11-29T08:51:51.55 0.6 undecidable manual S 83 61.494 50 0.33 44
IV.MURB.HHE. 2021-11-29T08:51:50.78 0.3 undecidable manual S 58 59.1963 50 0.17 68
IV.ATMI.HHZ. 2021-11-29T08:51:48.26 0.6 undecidable manual S 37 49.1175 50 0.35 45
IV.ATVA.EHE. 2021-11-29T08:51:46.06 0.6 undecidable manual S 43 45.3213 96 -0.66 41
IV.CAFI.HHZ. 2021-11-29T08:51:45.11 0.6 undecidable manual S 7 39.1275 97 0.51 44
IV.CSNT.HHE. 2021-11-29T08:51:44.88 1.0 undecidable manual P 318 73.9704 50 0.32 21
IV.ATCC.EHN. 2021-11-29T08:51:43.05 1.0 undecidable manual P 69 63.7917 50 0.06 23
IV.ARCI.HHZ. 2021-11-29T08:51:43.55 0.3 undecidable manual S 248 37.629 97 -0.54 65
IV.MURB.HHE. 2021-11-29T08:51:41.68 1.0 undecidable manual P 58 59.1963 50 -0.61 20
IV.ASSB.HHN. 2021-11-29T08:51:41.90 0.3 undecidable manual P 83 61.494 50 -0.74 58
IV.MCIV.CHZ. 2021-11-29T08:51:40.63 0.3 undecidable manual S 220 28.9488 99 -0.48 68
IV.ATMI.HHZ. 2021-11-29T08:51:40.37 1.0 undecidable manual P 37 49.1175 50 -0.36 22
IV.CAFI.HHZ. 2021-11-29T08:51:39.18 0.1 positive manual P 7 39.1275 97 0.36 91
IV.ATVA.EHE. 2021-11-29T08:51:39.64 0.1 positive manual P 43 45.3213 96 -0.4 89
IV.ARCI.HHZ. 2021-11-29T08:51:38.89 0.3 undecidable manual P 248 37.629 97 0.37 68
IV.MGAB.HHZ. 2021-11-29T08:51:37.42 0.3 undecidable manual S 114 18.3705 104 -0.08 75
IV.MCIV.CHZ. 2021-11-29T08:51:36.93 0.3 undecidable manual P 220 28.9488 99 0.12 73
IV.SACS.HHZ. 2021-11-29T08:51:36.57 0.3 undecidable manual S 178 14.4744 108 0.38 71
IV.SACS.HHZ. 2021-11-29T08:51:34.40 0.1 positive manual P 178 14.4744 108 0.44 93
IV.MGAB.HHZ. 2021-11-29T08:51:34.65 0.1 negative manual P 114 18.3705 104 -0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SACS.HHE. ML:1.8 0.000823 0.26 AML other m 2021-11-29T08:51:36.69
IV.SACS.HNE. ML:1.9 0.0008959999999999999 0.28 AML other m 2021-11-29T08:51:36.83
IV.SACS.HHN. ML:2.0 0.0012415 0.26 AML other m 2021-11-29T08:51:36.85
IV.SACS.HNN. ML:2.0 0.0011844999999999998 0.26 AML other m 2021-11-29T08:51:36.86
IV.MGAB.HHN. ML:1.9 0.000679 0.3 AML other m 2021-11-29T08:51:39.18
IV.MGAB.HNN. ML:1.8 0.000606 0.9 AML other m 2021-11-29T08:51:39.49
IV.MGAB.HNE. ML:1.8 0.0006115000000000001 0.34 AML other m 2021-11-29T08:51:40.46
IV.MGAB.HHE. ML:1.8 0.000602 0.34 AML other m 2021-11-29T08:51:40.29
IV.MCIV.CHN. ML:1.7 0.0002785 0.82 AML other m 2021-11-29T08:51:41.37
IV.MCIV.CHE. ML:1.6 0.00021500000000000002 1.06 AML other m 2021-11-29T08:51:42.69
IV.ARCI.HHN. ML:1.6 0.00015099999999999998 0.44 AML other m 2021-11-29T08:51:44.72
IV.ARCI.HHE. ML:1.6 0.00014235000000000002 1.5 AML other m 2021-11-29T08:51:44.04
IV.CAFI.HHE. ML:1.8 0.0002065 0.66 AML other m 2021-11-29T08:51:45.41
IV.CAFI.HHN. ML:1.4 0.00008560000000000001 1.3 AML other m 2021-11-29T08:51:45.98
IV.ATMI.HHE. ML:2.0 0.0003055 0.22 AML other m 2021-11-29T08:51:49.15
IV.ATMI.HHN. ML:2.0 0.000252 0.24 AML other m 2021-11-29T08:51:49.61
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