Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 25-12-2021 and time 02:21:12 (UTC) in region 6 km S Scanno (AQ)

A magnitude ML 1.1 earthquake occured in region: 6 km S Scanno (AQ), on

  • 25-12-2021 02:21:12 (UTC)
  • 25-12-2021 03:21:12 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.8530, 13.8660 at 26 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 10 568 5038
Villetta Barrea AQ 10 653 5691
Civitella Alfedena AQ 12 296 5987
Bisegna AQ 12 223 6210
Rocca Pia AQ 13 178 6388
Barrea AQ 15 726 7114
Pettorano sul Gizio AQ 16 1376 8490
San Donato Val di Comino FR 17 2107 10597
Anversa degli Abruzzi AQ 17 341 10938
Rivisondoli AQ 17 700 11638
Pescocostanzo AQ 17 1128 12766
Lecce nei Marsi AQ 17 1702 14468
Introdacqua AQ 18 2126 16594
Roccaraso AQ 18 1627 18221
Gioia dei Marsi AQ 18 1989 20210
Scontrone AQ 19 574 20784
Bugnara AQ 19 1125 21909
Alfedena AQ 19 864 22773
Ortona dei Marsi AQ 20 542 23315
Campoli Appennino FR 20 1725 25040

Municipalities with at least 50000 inhabitants

An earthquake occurred to
61 Km SW of Chieti (51815 inhabitants)
68 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)
91 Km E of Latina (125985 inhabitants)
91 Km S of Teramo (54892 inhabitants)
92 Km E of Velletri (53303 inhabitants)
95 Km NW of Caserta (76326 inhabitants)
96 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
Bulletin
Rev1000 		Md 1.5
ML 1.1 		2021-12-25
02:21:12		 41.8527 13.8658 26 2022-03-30
13:04:26		 Bollettino Sismico Italiano INGV 99325671
Reviewed
Rev100 		Md 1.5 2021-12-25
02:21:12		 41.8512 13.8638 26 2021-12-25
02:52:16		 Sala Sismica INGV-Roma 98939361
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-25 02:21:12 ± 0.08
Latitude 41.8527 ± 0.0036
Longitude 13.8658 ± 0.0036
Depth (km) 26 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99325671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 391
Semi-minor axis of confidence ellipse (meter) 176
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 342
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) 77
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 26
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.60344
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 99325671
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-04 15:28:59

Md:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 8
Type of magnitude Md
Reference to an origin 99325671
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-04 15:28:59

Md:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 8
Type of magnitude Md
Reference to an origin 98939361
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-25 02:52:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
CR.ZAG.BHZ. 2021-12-25T02:22:50.18 3.0 undecidable manual Sg 4.59 0
OX.CAE.HHZ. 2021-12-25T02:22:03.13 3.0 undecidable manual Pg 7.08 0
IV.MTGR.HHZ. 2021-12-25T02:21:58.39 3.0 undecidable manual Pn -0.01 0
IV.GUAR.HNN. 2021-12-25T02:21:28.14 0.3 undecidable manual S 262 46.2204 112 0.14 71
IV.MIDA.HHE. 2021-12-25T02:21:26.36 0.3 undecidable manual S 126 39.7269 116 -0.06 73
IV.MCI.EHZ. 2021-12-25T02:21:26.55 0.3 undecidable manual S 186 40.3263 116 -0.02 74
IV.LRP.EHZ. 2021-12-25T02:21:25.04 0.3 undecidable manual S 225 32.4453 122 0.31 71
IV.LPEL.HHE. 2021-12-25T02:21:25.20 0.6 undecidable manual S 50 33.9438 121 0.15 49
IV.CERA.HNN. 2021-12-25T02:21:24.68 0.3 undecidable manual S 156 30.9468 123 0.29 71
IV.SGG.HNE. 2021-12-25T02:21:24.78 0.6 undecidable manual P 140 66.9774 105 0.32 44
IV.RNI2.HHZ. 2021-12-25T02:21:23.96 0.3 undecidable manual S 125 28.9488 126 0.02 76
IT.SULA.HNE. 2021-12-25T02:21:23.38 3.0 undecidable manual S 0.23 0
IV.GIUL.HHE. 2021-12-25T02:21:23.36 0.1 undecidable manual P 237 60.1953 107 -0.1 94
IT.SULP.HGN. 2021-12-25T02:21:23.53 3.0 undecidable manual S 0.09 0
IV.VAGA.HNN. 2021-12-25T02:21:22.68 0.3 undecidable manual P 148 57.2982 108 -0.35 67
IV.POFI.HHZ. 2021-12-25T02:21:22.12 0.3 undecidable manual S 220 19.6692 138 0.03 77
IV.FAGN.HHE. 2021-12-25T02:21:22.21 0.3 undecidable manual P 333 51.4152 110 0.05 72
IV.VVLD.HHZ. 2021-12-25T02:21:21.93 0.3 undecidable manual S 275 20.1687 137 -0.24 73
IV.GUAR.HNN. 2021-12-25T02:21:21.62 0.3 undecidable manual P 262 46.2204 112 0.2 70
IV.TST01.HHE. 2021-12-25T02:21:21.07 0.3 undecidable manual P 105 44.622 113 -0.12 72
IV.PTQR.HHZ. 2021-12-25T02:21:21.20 0.3 undecidable manual P 296 42.7239 114 0.27 70
IV.MIDA.HHE. 2021-12-25T02:21:20.24 0.1 positive manual P 126 39.7269 116 -0.27 94
IV.MCI.EHZ. 2021-12-25T02:21:20.86 0.3 undecidable manual P 186 40.3263 116 0.26 70
IT.OPI.HGN. 2021-12-25T02:21:20.46 0.3 undecidable manual S 199 8.9799 158 -0.1 77
IV.LPEL.HHE. 2021-12-25T02:21:19.90 0.3 undecidable manual P 50 33.9438 121 0.18 72
IV.CERA.HNN. 2021-12-25T02:21:19.23 0.1 undecidable manual P 156 30.9468 123 -0.11 99
IV.RNI2.HHZ. 2021-12-25T02:21:19.30 0.1 undecidable manual P 125 28.9488 126 0.22 97
IV.LRP.EHZ. 2021-12-25T02:21:19.39 0.1 negative manual P 225 32.4453 122 -0.14 98
IT.SULP.HGN. 2021-12-25T02:21:18.46 3.0 undecidable manual P -0.32 0
IT.SULA.HNE. 2021-12-25T02:21:18.43 3.0 undecidable manual P -0.18 0
IT.OPI.HGN. 2021-12-25T02:21:17.09 0.3 undecidable manual P 199 8.9799 158 -0.04 78
IV.VVLD.HHZ. 2021-12-25T02:21:17.79 0.1 negative manual P 275 20.1687 137 -0.27 98
IV.POFI.HHZ. 2021-12-25T02:21:17.86 0.1 undecidable manual P 220 19.6692 138 -0.15 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VVLD.HNE. ML:1.4 0.0001077043 0.8096 AML other m 2021-12-25T02:21:30.14
IV.VVLD.HHE. ML:0.8 0.00003173576 0.12 AML other m 2021-12-25T02:21:22.50
IV.VVLD.HHN. ML:1.0 0.00004593059 0.1408 AML other m 2021-12-25T02:21:22.77
IV.VVLD.HNN. ML:1.4 0.00012114265 0.7712 AML other m 2021-12-25T02:21:31.17
IV.POFI.HNN. ML:1.4 0.000118351965 0.76 AML other m 2021-12-25T02:21:26.64
IV.POFI.HNE. ML:1.5 0.00014194488499999998 0.8208 AML other m 2021-12-25T02:21:24.58
IV.POFI.HHE. ML:0.6 0.000020547724999999998 0.16 AML other m 2021-12-25T02:21:23.47
IV.POFI.HHN. ML:0.7 0.000024430260000000003 1 AML other m 2021-12-25T02:21:29.89
IV.RNI2.HNN. ML:1.2 0.00006337173 0.2192 AML other m 2021-12-25T02:21:26.26
IV.RNI2.HHN. ML:1.2 0.00006206325875 0.1984 AML other m 2021-12-25T02:21:26.25
IV.RNI2.HHE. ML:1.3 0.000075915545 1 AML other m 2021-12-25T02:21:33.81
IV.RNI2.HNE. ML:1.3 0.00006886073 0.5312 AML other m 2021-12-25T02:21:26.87
IV.LRP.EHE. ML:0.9 0.00003194855 0.16 AML other m 2021-12-25T02:21:28.05
IV.LRP.EHN. ML:0.6 0.000013386788 0.2192 AML other m 2021-12-25T02:21:28.52
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