Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 25-12-2021 and time 17:56:34 (Italy) in region 6 km SW Scanno (AQ)

A magnitude ML 1.2 earthquake occured in region: 6 km SW Scanno (AQ), on

  • 25-12-2021 16:56:34 (UTC)
  • 25-12-2021 17:56:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.8560, 13.8620 at 22 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
Scanno AQ 6 1847 1847
Pescasseroli AQ 8 2203 4050
Opi AQ 9 420 4470
Villalago AQ 9 568 5038
Villetta Barrea AQ 10 653 5691
Bisegna AQ 11 223 5914
Civitella Alfedena AQ 12 296 6210
Rocca Pia AQ 13 178 6388
Barrea AQ 15 726 7114
Pettorano sul Gizio AQ 16 1376 8490
Anversa degli Abruzzi AQ 16 341 8831
San Donato Val di Comino FR 17 2107 10938
Lecce nei Marsi AQ 17 1702 12640
Rivisondoli AQ 17 700 13340
Introdacqua AQ 17 2126 15466
Pescocostanzo AQ 17 1128 16594
Gioia dei Marsi AQ 18 1989 18583
Roccaraso AQ 18 1627 20210
Bugnara AQ 19 1125 21335
Scontrone AQ 19 574 21909
Ortona dei Marsi AQ 19 542 22451
Alfedena AQ 20 864 23315
Villavallelonga AQ 20 919 24234
Campoli Appennino FR 20 1725 25959

Municipalities with at least 50000 inhabitants

An earthquake occurred to
61 Km SW of Chieti (51815 inhabitants)
67 Km SE of L'Aquila (69753 inhabitants)
74 Km SW of Pescara (121014 inhabitants)
77 Km SW of Montesilvano (53738 inhabitants)
89 Km E of Tivoli (56533 inhabitants)
90 Km S of Teramo (54892 inhabitants)
91 Km E of Latina (125985 inhabitants)
92 Km E of Velletri (53303 inhabitants)
95 Km NW of Caserta (76326 inhabitants)
95 Km E 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 1.2 2021-12-25
16:56:34		 41.8558 13.8623 23 2021-12-25
23:34:11		 Sala Sismica INGV-Roma 98983531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-25 16:56:34 ± 0.06
Latitude 41.8558 ± 0.0027
Longitude 13.8623 ± 0.0036
Depth (km) 23 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 98983531

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 350
Semi-minor axis of confidence ellipse (meter) 23
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 45
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) 54
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.08274
Epicentral distance of station farthest from the epicenter (degree) 0.60704
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 19
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 98983531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-25 23:34:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIUL.HHN. 2021-12-25T16:56:53.23 1.0 undecidable manual S 237 60.1953 103 0.01 23
IV.GUAR.HNE. 2021-12-25T16:56:49.43 1.0 undecidable manual S 262 46.0206 108 -0.14 23
IV.MIDA.HHZ. 2021-12-25T16:56:48.16 0.3 undecidable manual S 126 40.1265 112 0.05 71
IV.PTQR.HHE. 2021-12-25T16:56:48.73 1.0 undecidable manual S 296 42.3243 110 0.08 24
IV.MCI.EHE. 2021-12-25T16:56:48.36 0.6 undecidable manual S 186 40.626 111 0.12 46
IV.T0110.HHZ. 2021-12-25T16:56:48.90 0.6 undecidable manual S 350 42.0246 110 0.32 45
IV.SGG.HNN. 2021-12-25T16:56:46.68 0.1 undecidable manual P 140 67.377 102 0.35 85
IV.CERA.HNN. 2021-12-25T16:56:46.34 0.3 undecidable manual S 156 31.4463 118 0.35 67
IV.LRP.EHZ. 2021-12-25T16:56:46.48 0.6 undecidable manual S 225 32.5452 117 0.23 46
IV.LPEL.HHZ. 2021-12-25T16:56:46.38 0.3 undecidable manual S 51 33.9438 116 -0.2 69
IV.RNI2.HHE. 2021-12-25T16:56:45.54 0.3 undecidable manual S 125 29.3484 120 0.03 72
IT.SULP.HGN. 2021-12-25T16:56:45.03 0.6 undecidable manual S 12 25.9518 124 0.28 47
IV.GIUL.HHN. 2021-12-25T16:56:45.14 0.1 undecidable manual P 237 60.1953 103 -0.1 90
IV.FAGN.HHE. 2021-12-25T16:56:44.08 0.3 undecidable manual P 333 50.9157 106 0.22 68
IV.VAGA.HNN. 2021-12-25T16:56:44.96 0.3 undecidable manual P 148 57.7977 104 0.08 68
IV.VCEL.EHE. 2021-12-25T16:56:44.93 1.0 undecidable manual P 358 59.7957 104 -0.25 22
IV.POFI.HHZ. 2021-12-25T16:56:43.23 0.6 undecidable manual S 219 19.7691 133 -0.21 48
IV.GUAR.HNE. 2021-12-25T16:56:43.38 0.3 undecidable manual P 262 46.0206 108 0.25 68
IV.VVLD.HHZ. 2021-12-25T16:56:43.56 0.3 undecidable manual S 275 19.869 133 0.1 73
IV.TST01.HHN. 2021-12-25T16:56:42.70 1.0 undecidable manual P 105 45.0216 109 -0.29 22
IV.T0110.HHZ. 2021-12-25T16:56:42.77 0.1 undecidable manual P 350 42.0246 110 0.21 92
IV.PTQR.HHE. 2021-12-25T16:56:42.37 0.3 undecidable manual P 296 42.3243 110 -0.23 68
IV.MCI.EHE. 2021-12-25T16:56:42.16 0.1 undecidable manual P 186 40.626 111 -0.2 92
IT.OPI.HGZ. 2021-12-25T16:56:41.95 0.3 undecidable manual S 197 9.1797 155 0.19 73
IV.LPEL.HHZ. 2021-12-25T16:56:41.31 0.1 undecidable manual P 51 33.9438 116 -0.1 95
IV.MIDA.HHZ. 2021-12-25T16:56:41.86 0.1 positive manual P 126 40.1265 112 -0.43 88
IV.LRP.EHZ. 2021-12-25T16:56:41.01 0.1 negative manual P 225 32.5452 117 -0.2 93
IV.CERA.HNN. 2021-12-25T16:56:40.88 0.1 undecidable manual P 156 31.4463 118 -0.19 94
IV.RNI2.HHE. 2021-12-25T16:56:40.93 0.1 positive manual P 125 29.3484 120 0.14 95
IT.SULP.HGN. 2021-12-25T16:56:40.37 0.1 undecidable manual P 12 25.9518 124 0.02 98
IV.POFI.HHZ. 2021-12-25T16:56:39.55 0.1 positive manual P 219 19.7691 133 -0.05 98
IV.VVLD.HHZ. 2021-12-25T16:56:39.43 0.1 negative manual P 275 19.869 133 -0.17 96
IT.OPI.HGZ. 2021-12-25T16:56:38.57 0.1 undecidable manual P 197 9.1797 155 -0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VVLD.HHE. ML:0.9 0.000046005805 0.4608 AML other m 2021-12-25T16:56:49.53
IV.VVLD.HHN. ML:1.0 0.000050047185 0.1408 AML other m 2021-12-25T16:56:44.49
IV.VVLD.HNE. ML:1.4 0.00013905431500000002 0.9088 AML other m 2021-12-25T16:56:51.02
IV.VVLD.HNN. ML:1.4 0.00011893684999999999 0.8704 AML other m 2021-12-25T16:56:50.43
IV.LRP.EHE. ML:1.1 0.000050446819499999996 1.0112 AML other m 2021-12-25T16:57:00.92
IV.LRP.EHN. ML:0.6 0.000013074255 0.4992 AML other m 2021-12-25T16:56:46.64
IV.LPEL.HNE. ML:1.6 0.0001539906 0.6656 AML other m 2021-12-25T16:56:45.74
IV.LPEL.HNN. ML:1.6 0.0001372851 0.8192 AML other m 2021-12-25T16:57:06.41
IV.LPEL.HHE. ML:1.3 0.00006552283 2.6496 AML other m 2021-12-25T16:56:49.97
IV.LPEL.HHN. ML:0.9 0.000028513385000000003 0.1408 AML other m 2021-12-25T16:56:49.29
IV.T0110.HHE. ML:1.4 0.0000739857 1.664 AML other m 2021-12-25T16:56:57.67
IV.T0110.HHN. ML:1.3 0.000052833135 0.8192 AML other m 2021-12-25T16:56:56.23
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