Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 20-06-2021 and time 20:21:12 (UTC) in region 3 km W Castel Ritaldi (PG)

A magnitude ML 1.1 earthquake occured in region: 3 km W Castel Ritaldi (PG), on

  • 20-06-2021 20:21:12 (UTC)
  • 20-06-2021 22:21:12 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8380, 12.6350 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.

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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
Castel Ritaldi PG 3 3278 3278
Giano dell'Umbria PG 5 3846 7124
Montefalco PG 7 5679 12803
Gualdo Cattaneo PG 10 6155 18958
Trevi PG 10 8469 27427
Bevagna PG 11 5081 32508
Massa Martana PG 11 3770 36278
Campello sul Clitunno PG 12 2442 38720
Spoleto PG 14 38218 76938
Foligno PG 14 57155 134093
Collazzone PG 17 3473 137566
Spello PG 18 8645 146211
Acquasparta TR 18 4778 150989
Cannara PG 18 4305 155294
Todi PG 20 16851 172145

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km SW of Foligno (57155 inhabitants)
31 Km N of Terni (111501 inhabitants)
36 Km SE of Perugia (166134 inhabitants)
64 Km NE of Viterbo (67173 inhabitants)
83 Km NW of L'Aquila (69753 inhabitants)
90 Km W of Teramo (54892 inhabitants)
93 Km SE of Arezzo (99543 inhabitants)
93 Km N of Guidonia Montecelio (88673 inhabitants)
98 Km N of Tivoli (56533 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 2021-06-20
20:21:12		 42.8378 12.6353 9 2021-06-20
20:27:58		 Sala Sismica INGV-Roma 91616531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-06-20 20:21:12 ± 0.06
Latitude 42.8378 ± 0.0027
Longitude 12.6353 ± 0.0049
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 91616531

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 352
Semi-minor axis of confidence ellipse (meter) 306
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 254
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
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) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.05846
Epicentral distance of station farthest from the epicenter (degree) 0.39031
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 91616531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-06-20 20:27:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GAVE.EHZ. 2021-06-20T20:21:22.08 0.3 undecidable manual S 127 26.5512 108 0.13 71
IV.MGAB.HHZ. 2021-06-20T20:21:21.13 0.6 undecidable manual P 281 43.3233 50 0.48 42
IV.CESX.HHZ. 2021-06-20T20:21:21.44 0.3 undecidable manual S 189 25.752 109 -0.24 69
IV.ASSB.HHZ. 2021-06-20T20:21:20.55 0.3 undecidable manual S 5 22.755 111 -0.17 71
IV.NRCA.HHZ. 2021-06-20T20:21:19.89 0.3 undecidable manual P 91 38.9277 50 -0.09 70
IV.ATCC.EHZ. 2021-06-20T20:21:19.67 0.3 undecidable manual P 1 38.5281 50 -0.24 68
IV.ARRO.EHZ. 2021-06-20T20:21:18.65 0.3 undecidable manual P 160 30.6471 106 0.03 72
IV.CESI.HHZ. 2021-06-20T20:21:18.32 0.3 undecidable manual P 50 28.6491 107 0.07 71
IV.CESX.HHZ. 2021-06-20T20:21:17.54 0.3 undecidable manual P 189 25.752 109 -0.16 70
IV.GAVE.EHZ. 2021-06-20T20:21:17.94 0.3 undecidable manual P 127 26.5512 108 0.09 71
IV.ASSB.HHZ. 2021-06-20T20:21:17.23 0.3 undecidable manual P 5 22.755 111 0.09 72
IT.GNU.HGE. 2021-06-20T20:21:16.03 0.1 undecidable manual S 235 6.4935 143 0.01 100
IV.MOMA.HHZ. 2021-06-20T20:21:15.93 0.3 undecidable manual S 235 6.4935 143 -0.09 74
IV.MOMA.HHZ. 2021-06-20T20:21:14.50 0.1 undecidable manual P 235 6.4935 143 0.07 99
IT.GNU.HGE. 2021-06-20T20:21:14.56 0.1 undecidable manual P 235 6.4935 143 0.14 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.8 0.0011600000000000002 0.16 AML other m 2021-06-20T20:21:16.63
IV.MOMA.HNE. ML:1.8 0.001073 0.14 AML other m 2021-06-20T20:21:16.63
IV.MOMA.HHN. ML:1.7 0.0009915 0.26 AML other m 2021-06-20T20:21:16.73
IV.MOMA.HNN. ML:1.7 0.0009516527499999999 0.2688 AML other m 2021-06-20T20:21:16.74
IV.ASSB.HHN. ML:1.2 0.00011613532 0.2048 AML other m 2021-06-20T20:21:21.04
IV.ASSB.HHE. ML:1.1 0.00008838661999999999 0.0768 AML other m 2021-06-20T20:21:21.48
IV.CESX.HHE. ML:1.0 0.000066775595 0.2048 AML other m 2021-06-20T20:21:21.91
IV.CESX.HHN. ML:1.0 0.00006486671000000001 0.1152 AML other m 2021-06-20T20:21:22.67
IV.GAVE.EHE. ML:1.2 0.000094334865 0.1408 AML other m 2021-06-20T20:21:22.71
IV.GAVE.EHN. ML:1.1 0.00007664999999999999 0.18 AML other m 2021-06-20T20:21:23.11
IV.CESI.HHN. ML:1.1 0.00006615 0.26 AML other m 2021-06-20T20:21:23.20
IV.ARRO.EHE. ML:1.0 0.0000433 1.74 AML other m 2021-06-20T20:21:24.07
IV.CESI.HHE. ML:0.8 0.00003105917 0.1664 AML other m 2021-06-20T20:21:24.15
IV.ARRO.EHN. ML:0.8 0.000031799999999999994 0.24 AML other m 2021-06-20T20:21:24.16
IV.NRCA.HHN. ML:1.1 0.00004350098500000001 0.1152 AML other m 2021-06-20T20:21:27.48
IV.ATCC.EHN. ML:1.1 0.00004264726 0.32 AML other m 2021-06-20T20:21:26.09
IV.ATCC.EHE. ML:1.0 0.000042016285 0.32 AML other m 2021-06-20T20:21:26.94
IV.NRCA.HHE. ML:1.1 0.000047350000000000006 0.78 AML other m 2021-06-20T20:21:27.60
IV.MGAB.HHE. ML:0.9 0.0000273 0.2 AML other m 2021-06-20T20:21:28.05
IV.MGAB.HHN. ML:1.0 0.0000347 0.14 AML other m 2021-06-20T20:21:28.23
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