Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 27-12-2021 and time 12:44:33 (UTC) in region 2 km W Vallo di Nera (PG)

A magnitude ML 1.2 earthquake occured in region: 2 km W Vallo di Nera (PG), on

  • 27-12-2021 12:44:33 (UTC)
  • 27-12-2021 13:44:33 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7770, 12.8360 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.

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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
Vallo di Nera PG 2 364 364
Sant'Anatolia di Narco PG 5 564 928
Campello sul Clitunno PG 7 2442 3370
Scheggino PG 7 461 3831
Cerreto di Spoleto PG 8 1075 4906
Spoleto PG 9 38218 43124
Poggiodomo PG 11 117 43241
Trevi PG 13 8469 51710
Castel Ritaldi PG 14 3278 54988
Sellano PG 15 1079 56067
Cascia PG 16 3217 59284
Monteleone di Spoleto PG 17 599 59883
Ferentillo TR 18 1913 61796
Montefalco PG 20 5679 67475

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SE of Foligno (57155 inhabitants)
29 Km NE of Terni (111501 inhabitants)
52 Km SE of Perugia (166134 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
72 Km NE of Viterbo (67173 inhabitants)
72 Km W of Teramo (54892 inhabitants)
87 Km N of Guidonia Montecelio (88673 inhabitants)
90 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 1.2 2021-12-27
12:44:33		 42.7768 12.8362 10 2021-12-27
12:57:34		 Sala Sismica INGV-Roma 99055251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-27 12:44:33 ± 0.05
Latitude 42.7768 ± 0.0036
Longitude 12.8362 ± 0.0049
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 99055251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 389
Semi-minor axis of confidence ellipse (meter) 340
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 212
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 83
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.58546
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 99055251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-27 12:57:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PE3.EHZ. 2021-12-27T12:45:05.82 3.0 undecidable manual S 0.36 0
IV.PP3.EHZ. 2021-12-27T12:44:49.27 3.0 positive manual P -0.24 0
IV.EL6.EHZ. 2021-12-27T12:44:45.33 0.3 undecidable manual P 19 64.9905 50 -0.09 69
IV.CESI.HHZ. 2021-12-27T12:44:43.35 0.6 undecidable manual S 12 25.9518 50 -0.08 50
IV.SNTG.HHZ. 2021-12-27T12:44:43.64 0.3 undecidable manual P 9 53.7018 50 -0.04 71
IV.LNSS.HHZ. 2021-12-27T12:44:43.20 0.6 undecidable manual S 139 25.4523 50 -0.12 49
IV.MOMA.HHZ. 2021-12-27T12:44:42.22 0.6 undecidable manual S 278 21.867 115 -0.04 50
IV.ARRO.EHZ. 2021-12-27T12:44:42.37 0.6 undecidable manual S 195 22.6551 114 -0.14 49
IV.NRCA.HHZ. 2021-12-27T12:44:42.54 0.6 undecidable manual S 74 23.4543 114 -0.24 48
IV.CSP1.EHZ. 2021-12-27T12:44:42.42 0.3 undecidable manual P 40 46.0206 50 -0.07 72
IT.GNU.HGZ. 2021-12-27T12:44:42.32 0.6 undecidable manual S 278 21.867 115 0.06 50
IV.MC2.EHZ. 2021-12-27T12:44:40.57 0.3 undecidable manual P 62 32.3454 50 0.18 72
IV.FEMA.HNZ. 2021-12-27T12:44:40.30 0.3 undecidable manual P 40 26.9508 50 0.75 62
IV.ASSB.HHZ. 2021-12-27T12:44:40.56 0.3 undecidable manual P 334 32.8449 50 0.1 73
IV.FDMO.HHZ. 2021-12-27T12:44:40.74 0.3 undecidable manual P 35 35.3424 50 -0.11 73
IV.LNSS.HHZ. 2021-12-27T12:44:39.25 0.3 undecidable manual P 139 25.4523 50 -0.08 75
IV.CESI.HHZ. 2021-12-27T12:44:39.35 0.1 undecidable manual P 12 25.9518 50 -0.05 100
IT.MTCL.HGZ. 2021-12-27T12:44:39.49 0.3 undecidable manual P 29 27.5502 50 -0.15 73
IV.GAVE.EHZ. 2021-12-27T12:44:39.18 0.6 undecidable manual S 153 10.4784 134 0.2 50
IV.MOMA.HHZ. 2021-12-27T12:44:38.66 0.3 undecidable manual P 278 21.867 115 -0.06 75
IV.ARRO.EHZ. 2021-12-27T12:44:38.76 0.3 undecidable manual P 195 22.6551 114 -0.1 75
IV.NRCA.HHZ. 2021-12-27T12:44:38.85 0.3 undecidable manual P 74 23.4543 114 -0.17 73
IT.GNU.HGZ. 2021-12-27T12:44:38.68 0.3 undecidable manual P 278 21.867 115 -0.04 76
IV.GAVE.EHZ. 2021-12-27T12:44:37.09 0.3 undecidable manual P 153 10.4784 134 0.27 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.3 0.000124 0.2 AML other m 2021-12-27T12:44:42.76
IV.NRCA.HHN. ML:1.3 0.0001272 0.6 AML other m 2021-12-27T12:44:42.70
IV.MOMA.HHN. ML:0.9 0.000051699999999999996 0.2 AML other m 2021-12-27T12:44:42.85
IV.NRCA.HHE. ML:1.4 0.0001395 0.1 AML other m 2021-12-27T12:44:43.12
IV.ARRO.EHE. ML:0.7 0.00003515 0.74 AML other m 2021-12-27T12:44:43.88
IV.LNSS.HHE. ML:1.2 0.00009279999999999999 0.6 AML other m 2021-12-27T12:44:43.55
IV.LNSS.HHN. ML:1.3 0.00011649999999999999 1.52 AML other m 2021-12-27T12:44:43.06
IV.CESI.HHN. ML:1.4 0.000162 0.38 AML other m 2021-12-27T12:44:43.74
IV.CESI.HHE. ML:1.1 0.00007024999999999999 1.02 AML other m 2021-12-27T12:44:44.07
IV.ARRO.EHN. ML:0.8 0.000046299999999999994 0.62 AML other m 2021-12-27T12:44:44.11
IV.ASSB.HHE. ML:1.3 0.00008905 0.08 AML other m 2021-12-27T12:44:46.08
IV.ASSB.HHN. ML:1.4 0.00009800000000000001 0.24 AML other m 2021-12-27T12:44:46.09
IV.FDMO.HHE. ML:1.1 0.00005615 0.22 AML other m 2021-12-27T12:44:46.35
IV.FDMO.HHN. ML:1.3 0.00007505000000000001 0.4 AML other m 2021-12-27T12:44:46.32
IV.MC2.EHN. ML:1.4 0.00011885 1.72 AML other m 2021-12-27T12:44:46.93
IV.MC2.EHE. ML:1.2 0.00007730000000000001 0.64 AML other m 2021-12-27T12:44:47.29
IV.EL6.EHE. ML:1.3 0.00003645 0.42 AML other m 2021-12-27T12:44:49.80
IV.EL6.EHN. ML:1.3 0.000033799999999999995 1.52 AML other m 2021-12-27T12:45:03.80
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