Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 22-10-2021 and time 20:35:11 (Italy) in region 4 km S Bettona (PG)

A magnitude ML 1.1 earthquake occured in region: 4 km S Bettona (PG), on

  • 22-10-2021 18:35:11 (UTC)
  • 22-10-2021 20:35:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9800, 12.4850 at 10 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Bettona PG 4 4367 4367
Deruta PG 5 9669 14036
Torgiano PG 7 6725 20761
Cannara PG 8 4305 25066
Gualdo Cattaneo PG 10 6155 31221
Collazzone PG 10 3473 34694
Bastia Umbra PG 11 21874 56568
Bevagna PG 11 5081 61649
Marsciano PG 14 18902 80551
Assisi PG 15 28299 108850
Spello PG 15 8645 117495
Perugia PG 16 166134 283629
Fratta Todina PG 17 1839 285468
Montefalco PG 17 5679 291147
Giano dell'Umbria PG 18 3846 294993
Foligno PG 18 57155 352148
Monte Castello di Vibio PG 19 1567 353715

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km SE of Perugia (166134 inhabitants)
18 Km W of Foligno (57155 inhabitants)
48 Km N of Terni (111501 inhabitants)
70 Km NE of Viterbo (67173 inhabitants)
73 Km SE of Arezzo (99543 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 1.1 2021-10-22
18:35:11		 42.9798 12.4852 10 2021-10-22
18:40:19		 Sala Sismica INGV-Roma 96884621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-22 18:35:11 ± 0.1
Latitude 42.9798 ± 0.0054
Longitude 12.4852 ± 0.0061
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96884621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 580
Semi-minor axis of confidence ellipse (meter) 435
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 154
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 96
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) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.51441
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:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 96884621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-22 18:40:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CAFI.HHZ. 2021-10-22T18:35:30.06 0.6 undecidable manual S 313 57.0984 50 0.59 41
IV.CPGN.EHZ. 2021-10-22T18:35:26.70 3.0 undecidable manual P 0.01 0
IV.MML1.EHZ. 2021-10-22T18:35:25.65 0.6 undecidable manual S 69 42.1245 50 0.18 47
IV.CESI.HHZ. 2021-10-22T18:35:23.08 0.3 undecidable manual S 85 34.1436 50 -0.26 71
IV.MGAB.HHZ. 2021-10-22T18:35:22.44 0.3 undecidable manual S 256 31.1466 50 -0.11 73
IV.MURB.HHZ. 2021-10-22T18:35:22.86 0.6 undecidable manual S 6 31.5462 50 0.21 48
IV.ATCC.EHZ. 2021-10-22T18:35:21.20 0.6 undecidable manual S 29 25.9518 50 0.04 50
IV.CAFI.HHZ. 2021-10-22T18:35:21.99 0.6 positive manual P 313 57.0984 50 0.07 47
IV.MOMA.HHZ. 2021-10-22T18:35:19.66 0.6 undecidable manual S 160 20.6682 117 0.01 51
IV.MML1.EHZ. 2021-10-22T18:35:19.69 1.0 negative manual P 69 42.1245 50 0.08 24
IV.ATMI.HHZ. 2021-10-22T18:35:19.11 0.1 undecidable manual P 336 43.0236 50 -0.64 83
IV.MURB.HHZ. 2021-10-22T18:35:18.21 1.0 undecidable manual P 6 31.5462 50 0.23 24
IV.CESI.HHZ. 2021-10-22T18:35:18.59 0.6 undecidable manual P 85 34.1436 50 0.21 48
IV.ASSB.HHZ. 2021-10-22T18:35:18.05 0.6 undecidable manual S 64 15.6732 123 -0.1 50
IV.ATCC.EHZ. 2021-10-22T18:35:17.17 0.6 undecidable manual P 29 25.9518 50 0.05 50
IV.MGAB.HHZ. 2021-10-22T18:35:17.92 0.1 negative manual P 256 31.1466 50 0 100
IV.MOMA.HHZ. 2021-10-22T18:35:16.43 0.3 negative manual P 160 20.6682 117 0.18 74
IV.ASSB.HHZ. 2021-10-22T18:35:15.45 1.0 undecidable manual P 64 15.6732 123 0.07 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASSB.HHN. ML:0.8 0.00006225 1.24 AML other m 2021-10-22T18:35:18.16
IV.ASSB.HHE. ML:0.8 0.00005345 0.64 AML other m 2021-10-22T18:35:19.32
IV.MOMA.HHE. ML:1.1 0.00009745000000000001 0.2 AML other m 2021-10-22T18:35:20.85
IV.MOMA.HHN. ML:1.1 0.00008460000000000001 0.94 AML other m 2021-10-22T18:35:21.56
IV.MGAB.HHN. ML:1.4 0.00011499999999999999 1.24 AML other m 2021-10-22T18:35:22.86
IV.MGAB.HHE. ML:1.2 0.00006950000000000001 1.48 AML other m 2021-10-22T18:35:23.03
IV.MURB.HHN. ML:1.1 0.000058700000000000004 0.78 AML other m 2021-10-22T18:35:24.40
IV.MURB.HHE. ML:1.1 0.00005355 1.1 AML other m 2021-10-22T18:35:26.74
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