Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 25-12-2021 and time 07:33:49 (Italy) in region 4 km W Preci (PG)

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

  • 25-12-2021 06:33:49 (UTC)
  • 25-12-2021 07:33:49 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8720, 12.9930 at 11 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
Preci PG 4 724 724
Sellano PG 6 1079 1803
Cerreto di Spoleto PG 9 1075 2878
Visso MC 10 1107 3985
Norcia PG 12 4957 8942
Castelsantangelo sul Nera MC 13 281 9223
Monte Cavallo MC 14 145 9368
Ussita MC 14 444 9812
Vallo di Nera PG 16 364 10176
Cascia PG 17 3217 13393
Poggiodomo PG 18 117 13510
Campello sul Clitunno PG 18 2442 15952
Pieve Torina MC 20 1458 17410
Trevi PG 20 8469 25879
Fiordimonte MC 20 202 26081
Sant'Anatolia di Narco PG 20 564 26645

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km E of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
56 Km E of Perugia (166134 inhabitants)
63 Km W of Teramo (54892 inhabitants)
67 Km NW of L'Aquila (69753 inhabitants)
88 Km NE of Viterbo (67173 inhabitants)
93 Km SW of Ancona (100861 inhabitants)
99 Km N of Guidonia Montecelio (88673 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 2021-12-25
06:33:49		 42.8725 12.9928 11 2021-12-25
06:44:17		 Sala Sismica INGV-Roma 98944021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-25 06:33:49 ± 0.08
Latitude 42.8725 ± 0.0036
Longitude 12.9928 ± 0.0061
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 98944021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 457
Semi-minor axis of confidence ellipse (meter) 330
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 236
Circular confidence region, given by single value of horizontal uncertainty (meter) 460.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 132
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.29768
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 10
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 98944021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-25 06:44:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MCRV.HHZ. 2021-12-25T06:35:10.45 3.0 undecidable manual Sg 2.03 0
GU.BURY.HHZ. 2021-12-25T06:35:02.15 3.0 undecidable manual Pg 10.54 0
IV.TDS.HHZ. 2021-12-25T06:34:52.14 3.0 undecidable manual Pn -1.23 0
IV.MCRV.HHZ. 2021-12-25T06:34:37.83 3.0 undecidable manual Pg 4.17 0
IV.RIBO.EHZ.01 2021-12-25T06:34:34.99 3.0 undecidable manual S -0.82 0
IV.RMP.HHZ. 2021-12-25T06:34:24.12 3.0 undecidable manual S -4 0
IV.PTRJ.HHZ. 2021-12-25T06:34:23.64 3.0 undecidable manual Pg 0.35 0
IV.SACS.HHZ. 2021-12-25T06:34:16.53 3.0 undecidable manual S -0.27 0
IV.ASSB.HHZ. 2021-12-25T06:34:00.51 0.3 undecidable manual S 305 33.0447 91 0.17 71
IV.LNSS.HHZ. 2021-12-25T06:33:59.25 0.3 undecidable manual S 173 30.1476 91 -0.32 66
IV.CSP1.EHZ. 2021-12-25T06:33:59.25 0.1 undecidable manual S 35 29.748 91 -0.22 95
IV.MML1.EHZ. 2021-12-25T06:33:58.67 0.3 undecidable manual S 356 26.751 91 0 73
IV.FDMO.HHZ. 2021-12-25T06:33:56.57 0.1 undecidable manual S 23 19.7691 92 -0.22 97
IV.MC2.EHZ. 2021-12-25T06:33:56.14 0.1 undecidable manual S 75 16.4724 94 0.21 96
IV.CSP1.EHZ. 2021-12-25T06:33:55.18 0.1 undecidable manual P 35 29.748 91 0.1 96
IV.ASSB.HHZ. 2021-12-25T06:33:55.73 0.3 undecidable manual P 305 33.0447 91 0.16 71
IV.CESI.HHZ. 2021-12-25T06:33:55.83 0.1 undecidable manual S 334 16.3725 94 -0.05 100
IV.LNSS.HHZ. 2021-12-25T06:33:55.09 0.3 undecidable manual P 173 30.1476 91 -0.04 71
IV.FEMA.HNZ. 2021-12-25T06:33:54.42 0.3 undecidable manual S 25 10.9779 116 -0.08 76
IV.NRCA.HHZ. 2021-12-25T06:33:54.42 0.1 undecidable manual S 114 10.7781 117 -0.03 100
IV.GAVE.EHZ. 2021-12-25T06:33:54.74 3.0 undecidable manual P 1.73 0
IT.MTCL.HGZ. 2021-12-25T06:33:54.71 0.3 undecidable manual S 2 13.4754 103 -0.42 70
IV.MML1.EHZ. 2021-12-25T06:33:54.59 0.3 undecidable manual P 356 26.751 91 -0.02 74
IV.MC2.EHZ. 2021-12-25T06:33:53.31 0.1 undecidable manual P 75 16.4724 94 0.28 95
IV.FDMO.HHZ. 2021-12-25T06:33:53.63 0.1 positive manual P 23 19.7691 92 0.1 97
IV.CESI.HHZ. 2021-12-25T06:33:53.26 0.1 undecidable manual P 334 16.3725 94 0.26 95
IT.MTCL.HGZ. 2021-12-25T06:33:52.43 0.3 undecidable manual P 2 13.4754 103 -0.14 74
IV.NRCA.HHZ. 2021-12-25T06:33:52.47 0.1 positive manual P 114 10.7781 117 0.29 96
IV.FEMA.HNZ. 2021-12-25T06:33:51.97 0.3 undecidable manual P 25 10.9779 116 -0.23 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.2 0.000192 0.56 AML other m 2021-12-25T06:33:54.54
IV.NRCA.HHE. ML:1.2 0.00017549999999999998 0.08 AML other m 2021-12-25T06:33:54.76
IV.FDMO.HHN. ML:1.0 0.0000804 1.14 AML other m 2021-12-25T06:33:56.79
IV.FDMO.HHE. ML:1.0 0.00006695 0.12 AML other m 2021-12-25T06:33:57.17
IV.MC2.EHE. ML:0.9 0.00006775000000000001 0.48 AML other m 2021-12-25T06:33:57.40
IV.MC2.EHN. ML:0.9 0.00007115000000000001 0.68 AML other m 2021-12-25T06:33:58.20
IV.LNSS.HHN. ML:1.4 0.000117 1.04 AML other m 2021-12-25T06:34:02.06
IV.LNSS.HHE. ML:1.3 0.00009525 0.64 AML other m 2021-12-25T06:34:02.98
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