Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 29-12-2021 and time 00:23:27 (Italy) in region 1 km N Introdacqua (AQ)

A magnitude ML 1.7 earthquake occured in region: 1 km N Introdacqua (AQ), on

  • 28-12-2021 23:23:27 (UTC)
  • 29-12-2021 00:23:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.0220, 13.9040 at 20 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Introdacqua AQ 2 2126 2126
Sulmona AQ 4 24557 26683
Bugnara AQ 4 1125 27808
Prezza AQ 7 945 28753
Pettorano sul Gizio AQ 7 1376 30129
Pacentro AQ 8 1174 31303
Anversa degli Abruzzi AQ 9 341 31644
Pratola Peligna AQ 9 7577 39221
Cansano AQ 9 274 39495
Cocullo AQ 11 230 39725
Villalago AQ 11 568 40293
Roccacasale AQ 11 693 40986
Rocca Pia AQ 11 178 41164
Campo di Giove AQ 12 803 41967
Raiano AQ 12 2815 44782
Corfinio AQ 13 1051 45833
Goriano Sicoli AQ 13 569 46402
Scanno AQ 13 1847 48249
Vittorito AQ 14 873 49122
Ortona dei Marsi AQ 15 542 49664
Sant'Eufemia a Maiella PE 16 278 49942
Bisegna AQ 16 223 50165
Castel di Ieri AQ 17 303 50468
Caramanico Terme PE 17 1929 52397
Popoli PE 18 5172 57569
Salle PE 18 308 57877
Gioia dei Marsi AQ 19 1989 59866
Castelvecchio Subequo AQ 19 982 60848
Molina Aterno AQ 20 386 61234
Pescocostanzo AQ 20 1128 62362
Palena CH 20 1392 63754

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km SW of Chieti (51815 inhabitants)
56 Km SE of L'Aquila (69753 inhabitants)
56 Km SW of Pescara (121014 inhabitants)
59 Km SW of Montesilvano (53738 inhabitants)
73 Km S of Teramo (54892 inhabitants)
92 Km E of Tivoli (56533 inhabitants)
97 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 		ML 1.7 2021-12-28
23:23:27		 42.0218 13.9035 20 2022-03-30
13:04:30		 Bollettino Sismico Italiano INGV 99715281
Reviewed
Rev100 		ML 1.8 2021-12-28
23:23:27		 42.0212 13.9025 18 2021-12-28
23:33:36		 Sala Sismica INGV-Roma 99092571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-28 23:23:27 ± 0.07
Latitude 42.0218 ± 0.0027
Longitude 13.9035 ± 0.0061
Depth (km) 20 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99715281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 409
Semi-minor axis of confidence ellipse (meter) 250
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 290
Circular confidence region, given by single value of horizontal uncertainty (meter) 410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 28
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) 0.72755
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 19
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 30
Type of magnitude ML
Reference to an origin 99092571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-28 23:33:36

ML:1.7

Field Value
Value 1.7
Uncertainty 0.4
Num. used stations 36
Type of magnitude ML
Reference to an origin 99715281
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-12 21:10:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MMUR.HNZ. 2021-12-28T23:23:54.10 3.0 undecidable manual Pn 0.47 0
IV.SGG.HHN. 2021-12-28T23:23:44.42 3.0 undecidable manual P 80.7636 2.86 0
IV.VCEL.EHZ. 2021-12-28T23:23:41.91 0.3 undecidable manual S 353 41.625 107 0.36 67
IV.POFI.HHZ. 2021-12-28T23:23:40.29 0.3 undecidable manual S 205 37.3293 109 -0.14 70
IV.GIUL.HHZ. 2021-12-28T23:23:40.32 0.6 undecidable manual P 226 74.37 98 -0.26 42
IV.TST01.HHZ. 2021-12-28T23:23:40.25 3.0 undecidable manual P 50.1165 3.34 0
IV.BSSO.HHE. 2021-12-28T23:23:40.08 1.0 undecidable manual P 133 77.7666 98 -1.03 16
IV.TERO.HHZ. 2021-12-28T23:23:40.17 3.0 undecidable manual P -0.34 0
IV.VAGA.HHZ. 2021-12-28T23:23:40.72 1.0 undecidable manual P 158 72.6717 98 0.4 21
IV.FAGN.HHZ. 2021-12-28T23:23:40.25 0.3 undecidable manual S 316 37.7289 109 -0.29 66
IV.VVLD.HHZ. 2021-12-28T23:23:38.42 0.3 undecidable manual S 234 28.6491 116 0.13 71
IT.OPI.HGE. 2021-12-28T23:23:38.04 0.3 undecidable manual S 193 27.9498 117 -0.08 72
IV.GUAR.HHZ. 2021-12-28T23:23:37.36 0.6 undecidable manual P 243 54.9006 102 -0.28 44
MN.AQU.HNN. 2021-12-28T23:23:37.58 0.6 undecidable manual P 312 55.1004 102 -0.09 45
IV.MIDA.HHZ. 2021-12-28T23:23:37.04 0.3 undecidable manual P 145 51.1155 103 -0.03 70
IV.CERA.HHZ. 2021-12-28T23:23:36.69 0.3 undecidable manual P 169 48.0186 104 0.09 69
IV.LPEL.HHZ. 2021-12-28T23:23:36.82 0.3 undecidable manual S 83 23.2545 123 -0.22 71
IV.RNI2.HHZ. 2021-12-28T23:23:36.15 0.3 undecidable manual P 150 40.9257 107 0.61 61
IV.LRP.EHZ. 2021-12-28T23:23:36.69 0.3 undecidable manual P 212 49.1175 104 -0.08 69
IV.POFI.HHZ. 2021-12-28T23:23:35.03 0.3 undecidable manual P 205 37.3293 109 0.02 71
IV.VCEL.EHZ. 2021-12-28T23:23:35.75 0.3 undecidable manual P 353 41.625 107 0.1 70
IV.PTQR.HHZ. 2021-12-28T23:23:35.74 0.3 undecidable manual P 270 41.4252 107 0.12 70
IT.SULP.HGZ. 2021-12-28T23:23:34.15 0.1 undecidable manual S 16 7.2927 157 -0.07 100
IV.FAGN.HHZ. 2021-12-28T23:23:34.95 0.3 undecidable manual P 316 37.7289 109 -0.12 69
IT.SULA.HNN. 2021-12-28T23:23:34.14 0.3 undecidable manual S 11 5.7942 161 0.06 75
IT.OPI.HGE. 2021-12-28T23:23:33.73 0.1 undecidable manual P 193 27.9498 117 0.05 96
IT.SULC.HNZ. 2021-12-28T23:23:33.93 0.3 undecidable manual S 5 5.0949 163 -0.09 75
IV.VVLD.HHZ. 2021-12-28T23:23:33.89 0.1 undecidable manual P 234 28.6491 116 0.11 95
IV.LPEL.HHZ. 2021-12-28T23:23:32.87 0.3 undecidable manual P 83 23.2545 123 -0.18 71
IT.SULC.HNZ. 2021-12-28T23:23:31.37 0.1 undecidable manual P 5 5.0949 163 0.05 100
IT.SULP.HGZ. 2021-12-28T23:23:31.46 0.1 undecidable manual P 16 7.2927 157 0.04 100
IT.SULA.HNN. 2021-12-28T23:23:31.44 0.3 undecidable manual P 11 5.7942 161 0.09 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IT.SULP.HGE. ML:4.2 0.11941073499999999 0.1664 AML other m 2021-12-28T23:23:34.84
IT.SULP.HGN. ML:4.4 0.184 0.18 AML other m 2021-12-28T23:23:35.59
IV.LPEL.HHN. ML:2.2 0.0007946775500000001 0.064 AML other m 2021-12-28T23:23:37.24
IV.LPEL.HNN. ML:2.1 0.0006335978499999999 0.0768 AML other m 2021-12-28T23:23:37.25
IV.LPEL.HHE. ML:2.3 0.00102349515 0.1152 AML other m 2021-12-28T23:23:37.45
IV.LPEL.HNE. ML:2.2 0.0008636831499999999 0.128 AML other m 2021-12-28T23:23:37.45
IV.VVLD.HHE. ML:2.0 0.0004425 0.2 AML other m 2021-12-28T23:23:38.62
IV.VVLD.HHN. ML:1.7 0.00021392050000000002 0.1152 AML other m 2021-12-28T23:23:39.65
IV.POFI.HHN. ML:1.6 0.000127 0.16 AML other m 2021-12-28T23:23:41.21
IV.POFI.HHE. ML:1.6 0.000141239545 0.2048 AML other m 2021-12-28T23:23:41.31
IV.FAGN.HHN. ML:2.1 0.0003745 0.24 AML other m 2021-12-28T23:23:41.49
IV.FAGN.HHE. ML:2.2 0.0005288075999999999 0.2176 AML other m 2021-12-28T23:23:42.28
IV.VCEL.EHN. ML:2.0 0.00027597985 0.256 AML other m 2021-12-28T23:23:44.65
IV.VCEL.EHE. ML:2.2 0.00045499999999999995 0.36 AML other m 2021-12-28T23:23:44.66
IV.CERA.HHE. ML:1.7 0.00011415 1 AML other m 2021-12-28T23:23:44.25
IV.LRP.EHN. ML:1.2 0.00003410776 0.256 AML other m 2021-12-28T23:23:50.66
IV.RNI2.HHN. ML:1.4 0.00008238402999999999 0.1408 AML other m 2021-12-28T23:23:44.38
IV.CERA.HNE. ML:1.7 0.000115789745 0.2944 AML other m 2021-12-28T23:23:44.26
IV.PTQR.HHE. ML:1.3 0.000062012055 0.1664 AML other m 2021-12-28T23:23:45.13
IV.RNI2.HHE. ML:1.6 0.000113087 0.1024 AML other m 2021-12-28T23:23:45.22
IV.CERA.HHN. ML:1.7 0.000132 0.4 AML other m 2021-12-28T23:23:45.73
IV.CERA.HNN. ML:1.7 0.000134 0.38 AML other m 2021-12-28T23:23:45.74
IV.LRP.EHE. ML:1.8 0.00014207205 0.2688 AML other m 2021-12-28T23:23:45.94
IV.GUAR.HHE. ML:1.4 0.000056783265 0.128 AML other m 2021-12-28T23:23:46.23
IV.PTQR.HHN. ML:1.3 0.00006675000000000001 0.94 AML other m 2021-12-28T23:23:46.07
IV.MIDA.HHN. ML:1.5 0.00008139992 0.192 AML other m 2021-12-28T23:23:47.28
IV.MIDA.HHE. ML:1.3 0.00004727992 0.192 AML other m 2021-12-28T23:23:50.05
IV.GUAR.HHN. ML:1.6 0.000079265285 0.2176 AML other m 2021-12-28T23:23:47.34
IV.GIUL.HHE. ML:1.4 0.00003735 1.46 AML other m 2021-12-28T23:23:51.07
IV.VVLD.HNN. ML:1.6 0.0001904311 0.1152 AML other m 2021-12-28T23:23:39.65
IV.VVLD.HNE. ML:2.0 0.0004082023 0.2048 AML other m 2021-12-28T23:23:38.62
IV.POFI.HNE. ML:1.7 0.0001607375 0.1792 AML other m 2021-12-28T23:23:41.31
IV.RNI2.HNN. ML:1.4 0.00007942295499999999 0.1408 AML other m 2021-12-28T23:23:44.38
IV.RNI2.HNE. ML:1.5 0.000103719485 0.1536 AML other m 2021-12-28T23:23:46.97
IV.MIDA.HNE. ML:1.6 0.000084731865 0.192 AML other m 2021-12-28T23:23:47.28
IV.TERO.HHN. ML:1.3 0.000031742384999999995 0.256 AML other m 2021-12-28T23:23:50.93
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