Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 18-11-2021 and time 03:55:19 (UTC) in region 1 km W Scheggino (PG)

A magnitude ML 1.1 earthquake occured in region: 1 km W Scheggino (PG), on

  • 18-11-2021 03:55:19 (UTC)
  • 18-11-2021 04:55:19 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7170, 12.8190 at 13 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
Scheggino PG 1 461 461
Sant'Anatolia di Narco PG 2 564 1025
Spoleto PG 7 38218 39243
Vallo di Nera PG 7 364 39607
Poggiodomo PG 10 117 39724
Ferentillo TR 11 1913 41637
Campello sul Clitunno PG 12 2442 44079
Monteleone di Spoleto PG 13 599 44678
Montefranco TR 14 1276 45954
Cerreto di Spoleto PG 14 1075 47029
Polino TR 15 233 47262
Arrone TR 15 2763 50025
Cascia PG 16 3217 53242
Castel Ritaldi PG 17 3278 56520
Trevi PG 19 8469 64989

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NE of Terni (111501 inhabitants)
28 Km SE of Foligno (57155 inhabitants)
56 Km SE of Perugia (166134 inhabitants)
63 Km NW of L'Aquila (69753 inhabitants)
67 Km NE of Viterbo (67173 inhabitants)
73 Km W of Teramo (54892 inhabitants)
80 Km N of Guidonia Montecelio (88673 inhabitants)
84 Km N of Tivoli (56533 inhabitants)
96 Km N of Roma (2864731 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 2021-11-18
03:55:19		 42.7172 12.8188 13 2021-11-18
04:02:44		 Sala Sismica INGV-Roma 97539451
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-18 03:55:19 ± 0.03
Latitude 42.7172 ± 0.0018
Longitude 12.8188 ± 0.0024
Depth (km) 13 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97539451

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 220
Semi-minor axis of confidence ellipse (meter) 63
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 173
Circular confidence region, given by single value of horizontal uncertainty (meter) 220.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 113
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.07
Epicentral distance of station closest to the epicenter (degree) 0.06025
Epicentral distance of station farthest from the epicenter (degree) 0.34534
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 13
Type of magnitude ML
Reference to an origin 97539451
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-18 04:02:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CESX.HHZ. 2021-11-18T03:55:28.33 0.3 undecidable manual S 238 22.4553 101 -0.03 98
IV.MOMA.HHZ. 2021-11-18T03:55:28.40 0.3 undecidable manual S 295 22.4553 101 0.05 97
IV.LNSS.HHZ. 2021-11-18T03:55:28.25 0.3 undecidable manual S 125 22.0668 101 -0.01 98
IV.ASSB.HHZ. 2021-11-18T03:55:27.28 0.3 undecidable manual P 340 38.3283 94 0.08 94
IV.CESI.HHZ. 2021-11-18T03:55:26.27 0.3 undecidable manual P 12 32.6451 95 -0.06 95
IV.NRCA.HNZ. 2021-11-18T03:55:25.47 0.3 undecidable manual P 62 27.2505 97 -0.03 96
IV.MOMA.HHZ. 2021-11-18T03:55:24.69 0.3 undecidable manual P 295 22.4553 101 -0.07 97
IV.LNSS.HHZ. 2021-11-18T03:55:24.80 0.3 undecidable manual P 125 22.0668 101 0.09 96
IV.GAVE.EHZ. 2021-11-18T03:55:24.69 0.3 undecidable manual S 114 6.6933 145 -0.06 100
IV.CESX.HHZ. 2021-11-18T03:55:24.73 0.3 undecidable manual P 238 22.4553 101 -0.04 97
IV.GAVE.EHZ. 2021-11-18T03:55:22.79 0.3 undecidable manual P 114 6.6933 145 0.11 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.6 0.000433 1.7 AML other m 2021-11-18T03:55:25.97
IV.GAVE.EHE. ML:1.4 0.0002963091 0.16 AML other m 2021-11-18T03:55:25.24
IV.MOMA.HHN. ML:0.9 0.000049689125 0.1792 AML other m 2021-11-18T03:55:29.07
IV.MOMA.HHE. ML:1.2 0.00008960000000000001 0.16 AML other m 2021-11-18T03:55:29.41
IV.GAVE.HNE. ML:1.4 0.00033460235 0.1728 AML other m 2021-11-18T03:55:25.14
IV.GAVE.HNN. ML:1.0 0.000132860195 0.3008 AML other m 2021-11-18T03:55:24.97
IV.MOMA.HNE. ML:1.2 0.000099178135 0.16 AML other m 2021-11-18T03:55:29.41
IV.LNSS.HHE. ML:1.2 0.00009725116999999999 0.1824 AML other m 2021-11-18T03:55:28.68
IV.LNSS.HHN. ML:1.2 0.00009530240500000001 0.2016 AML other m 2021-11-18T03:55:28.71
IV.CESI.HHE. ML:0.8 0.000025582600000000005 0.16 AML other m 2021-11-18T03:55:31.30
IV.CESI.HHN. ML:1.0 0.000037963135000000005 0.1792 AML other m 2021-11-18T03:55:31.45
IV.ASSB.HHE. ML:0.8 0.0000247969 0.16 AML other m 2021-11-18T03:55:33.05
IV.ASSB.HHN. ML:0.8 0.000026260215 0.1792 AML other m 2021-11-18T03:55:34.71
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