Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 28-12-2021 and time 16:20:31 (Italy) in region 4 km W Cerreto di Spoleto (PG)

A magnitude ML 0.8 earthquake occured in region: 4 km W Cerreto di Spoleto (PG), on

  • 28-12-2021 15:20:31 (UTC)
  • 28-12-2021 16:20:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8180, 12.8680 at 17 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
Cerreto di Spoleto PG 4 1075 1075
Vallo di Nera PG 5 364 1439
Campello sul Clitunno PG 7 2442 3881
Sellano PG 9 1079 4960
Sant'Anatolia di Narco PG 10 564 5524
Trevi PG 12 8469 13993
Scheggino PG 12 461 14454
Poggiodomo PG 13 117 14571
Spoleto PG 14 38218 52789
Preci PG 16 724 53513
Castel Ritaldi PG 16 3278 56791
Cascia PG 16 3217 60008
Norcia PG 19 4957 64965
Montefalco PG 20 5679 70644
Monteleone di Spoleto PG 20 599 71243

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km SE of Foligno (57155 inhabitants)
34 Km NE of Terni (111501 inhabitants)
51 Km SE of Perugia (166134 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
71 Km W of Teramo (54892 inhabitants)
77 Km NE of Viterbo (67173 inhabitants)
92 Km N of Guidonia Montecelio (88673 inhabitants)
95 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 0.8 2021-12-28
15:20:31		 42.8182 12.8682 17 2021-12-28
15:28:27		 Sala Sismica INGV-Roma 99080571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-28 15:20:31 ± 0.15
Latitude 42.8182 ± 0.0072
Longitude 12.8682 ± 0.0110
Depth (km) 17 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 99080571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 839
Semi-minor axis of confidence ellipse (meter) 656
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 115
Circular confidence region, given by single value of horizontal uncertainty (meter) 840.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 86
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 13
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) 0.47754
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 99080571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-28 15:28:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ORI.HHZ. 2021-12-28T15:22:30.73 3.0 undecidable manual Sg 12.38 0
IV.VOBA.EHZ. 2021-12-28T15:22:08.36 3.0 undecidable manual Sn 2.75 0
GU.RNCA.HHZ. 2021-12-28T15:22:04.08 3.0 undecidable manual Sn -1.87 0
IV.ZEN8.EHZ. 2021-12-28T15:22:02.63 3.0 undecidable manual Sn -0.83 0
IV.MPNC.HHZ. 2021-12-28T15:21:57.99 3.0 undecidable manual Pg 9.82 0
IV.GIZZ.HHZ. 2021-12-28T15:21:53.97 3.0 positive manual Pg 11.99 0
IV.SNAL.HNZ. 2021-12-28T15:21:47.78 3.0 undecidable manual Sg 0.79 0
IV.SARZ.HHZ. 2021-12-28T15:21:40.31 3.0 negative manual Pg 12.39 0
IV.TDS.HHZ. 2021-12-28T15:21:36.36 3.0 undecidable manual Pn 1.26 0
IV.ZEN8.EHZ. 2021-12-28T15:21:35.25 3.0 undecidable manual Pg 11.84 0
MN.TRI.HHZ. 2021-12-28T15:21:25.50 3.0 positive manual Pg 5.97 0
IV.IMOL.HNZ. 2021-12-28T15:21:24.69 3.0 undecidable manual Sn -2.97 0
IV.PZUN.HHZ. 2021-12-28T15:21:22.00 3.0 negative manual Pn 0.8 0
RD.PGF.BHZ. 2021-12-28T15:21:22.44 3.0 undecidable manual Pn 3.25 0
IV.MAGA.HHZ. 2021-12-28T15:21:21.51 3.0 undecidable manual Pn -4.03 0
IV.CELB.HHZ. 2021-12-28T15:21:12.44 3.0 undecidable manual Pg 5.73 0
IV.IMOL.HNZ. 2021-12-28T15:21:05.09 3.0 negative manual Pg 1.79 0
IV.APEC.HHZ. 2021-12-28T15:21:02.31 3.0 undecidable manual S -0.11 0
IV.LAV9.HHZ. 2021-12-28T15:20:51.43 3.0 undecidable manual P -3.7 0
IV.FDMO.HHE. 2021-12-28T15:20:42.25 0.6 undecidable manual S 36 30.0477 108 0.13 49
IV.SAP2.EHZ. 2021-12-28T15:20:41.00 0.3 negative manual P 54 53.0025 99 -0.03 71
IV.MOMA.HHE. 2021-12-28T15:20:40.62 0.6 undecidable manual S 266 24.2535 114 -0.07 50
IV.NRCA.HHZ. 2021-12-28T15:20:39.54 0.6 undecidable manual S 85 20.0688 120 -0.15 49
IV.CESI.HHZ. 2021-12-28T15:20:39.73 0.6 undecidable manual S 8 20.9679 119 -0.15 50
IV.GAVE.EHZ. 2021-12-28T15:20:38.31 0.6 undecidable manual S 171 14.1747 133 -0.1 50
IV.ASSB.HHN. 2021-12-28T15:20:37.19 0.1 undecidable manual P 326 30.1476 108 -0.4 93
IV.ARRO.EHZ. 2021-12-28T15:20:37.03 0.1 undecidable manual P 198 27.75 110 -0.22 95
IV.FDMO.HHE. 2021-12-28T15:20:37.57 0.1 undecidable manual P 36 30.0477 108 -0.01 100
IV.NRCA.HHZ. 2021-12-28T15:20:36.42 1.0 undecidable manual P 85 20.0688 120 0.25 24
IV.CESI.HHZ. 2021-12-28T15:20:36.60 0.1 undecidable manual P 8 20.9679 119 0.32 95
IV.MOMA.HHE. 2021-12-28T15:20:36.96 0.1 undecidable manual P 266 24.2535 114 0.21 96
IV.GAVE.EHZ. 2021-12-28T15:20:35.73 0.3 negative manual P 171 14.1747 133 0.3 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHE. ML:0.9 0.0000636 0.12 AML other m 2021-12-28T15:20:38.44
IV.GAVE.EHN. ML:0.9 0.0000618 1.08 AML other m 2021-12-28T15:20:38.00
IV.CESI.HHN. ML:0.8 0.0000353 0.6 AML other m 2021-12-28T15:20:40.07
IV.CESI.HHE. ML:0.5 0.000017852970999999997 0.1024 AML other m 2021-12-28T15:20:40.18
IV.GAVE.HNE. ML:1.2 0.00012926425 0.6528 AML other m 2021-12-28T15:20:41.02
IV.NRCA.HHE. ML:0.7 0.00003211482 0.0896 AML other m 2021-12-28T15:20:40.41
IV.NRCA.HHN. ML:0.9 0.000047412305 0.1536 AML other m 2021-12-28T15:20:39.81
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