Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 23-12-2021 and time 02:33:07 (UTC) in region 1 km SW Vallerotonda (FR)

A magnitude ML 1.4 earthquake occured in region: 1 km SW Vallerotonda (FR), on

  • 23-12-2021 02:33:07 (UTC)
  • 23-12-2021 03:33:07 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.5470, 13.9020 at 10 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
Vallerotonda FR 1 1581 1581
Sant'Elia Fiumerapido FR 3 6166 7747
Acquafondata FR 4 263 8010
Viticuso FR 6 353 8363
Cervaro FR 7 8109 16472
San Biagio Saracinisco FR 8 349 16821
Belmonte Castello FR 8 739 17560
Cassino FR 8 36142 53702
Villa Latina FR 9 1241 54943
San Vittore del Lazio FR 10 2636 57579
Terelle FR 10 422 58001
Conca Casale IS 11 200 58201
Picinisco FR 12 1218 59419
Villa Santa Lucia FR 12 2632 62051
Atina FR 12 4316 66367
San Pietro Infine CE 12 944 67311
Filignano IS 13 648 67959
Venafro IS 14 11280 79239
Piedimonte San Germano FR 14 6535 85774
Pozzilli IS 14 2380 88154
Settefrati FR 15 728 88882
Gallinaro FR 15 1269 90151
Scapoli IS 15 680 90831
Pignataro Interamna FR 15 2595 93426
Rocca d'Evandro CE 17 3283 96709
Casalattico FR 17 574 97283
Sant'Apollinare FR 17 1919 99202
Mignano Monte Lungo CE 17 3250 102452
Castrocielo FR 17 3965 106417
Colle San Magno FR 17 699 107116
Aquino FR 18 5370 112486
Pizzone IS 18 329 112815
Sant'Ambrogio sul Garigliano FR 18 966 113781
Rocchetta a Volturno IS 18 1113 114894
Colli a Volturno IS 18 1349 116243
Montaquila IS 18 2456 118699
Castel San Vincenzo IS 18 516 119215
Casalvieri FR 18 2698 121913
San Giorgio a Liri FR 19 3164 125077
Roccasecca FR 19 7365 132442
San Donato Val di Comino FR 20 2107 134549

Municipalities with at least 50000 inhabitants

An earthquake occurred to
64 Km NW of Caserta (76326 inhabitants)
69 Km NW of Aversa (53047 inhabitants)
73 Km NW of Giugliano in Campania (122974 inhabitants)
76 Km NW of Marano di Napoli (59874 inhabitants)
77 Km NW of Afragola (65057 inhabitants)
77 Km NW of Acerra (59573 inhabitants)
78 Km NW of Casoria (77642 inhabitants)
79 Km N of Pozzuoli (81661 inhabitants)
84 Km E of Latina (125985 inhabitants)
84 Km NW of Napoli (974074 inhabitants)
87 Km NW of Benevento (60091 inhabitants)
89 Km NW of Portici (55274 inhabitants)
90 Km NW of Ercolano (53709 inhabitants)
92 Km S of Chieti (51815 inhabitants)
93 Km NW of Torre del Greco (86275 inhabitants)
95 Km E of Velletri (53303 inhabitants)
99 Km SE of L'Aquila (69753 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 1.4 2021-12-23
02:33:07		 41.5468 13.9022 10 2022-03-30
13:04:42		 Bollettino Sismico Italiano INGV 102365591
Reviewed
Rev100 		ML 1.4 2021-12-23
02:33:07		 41.5438 13.8932 11 2021-12-23
03:22:40		 Sala Sismica INGV-Roma 98838031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-23 02:33:07 ± 0.08
Latitude 41.5468 ± 0.0054
Longitude 13.9022 ± 0.0048
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 102365591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 579
Semi-minor axis of confidence ellipse (meter) 307
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 200
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81
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) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.48473
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 22
Type of magnitude ML
Reference to an origin 102365591
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-25 13:41:14

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 22
Type of magnitude ML
Reference to an origin 98838031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-23 03:22:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
OT.OT17.EHZ. 2021-12-23T02:33:45.52 3.0 undecidable manual S 1.56 0
IX.COL3.HHZ.02 2021-12-23T02:33:31.11 3.0 undecidable manual P -0.24 0
IV.SGG.HHZ. 2021-12-23T02:33:22.06 0.6 undecidable manual S 114 43.4232 50 0.34 44
IV.VVLD.HHZ. 2021-12-23T02:33:21.59 0.6 undecidable manual S 327 42.624 50 0.1 47
IV.VAGA.HHZ. 2021-12-23T02:33:18.57 0.6 undecidable manual S 118 31.2465 50 0.12 48
IV.MIDA.HHZ. 2021-12-23T02:33:18.18 0.6 undecidable manual S 70 31.0467 50 -0.22 47
IV.LRP.EHN. 2021-12-23T02:33:17.92 0.6 undecidable manual S 293 28.4493 50 0.21 47
IV.RNI2.HHZ. 2021-12-23T02:33:17.80 0.6 undecidable manual S 50 27.0507 50 0.46 45
IT.OPI.HGE. 2021-12-23T02:33:17.20 0.3 undecidable manual S 347 26.1516 50 0.11 72
IV.GIUL.HHZ. 2021-12-23T02:33:17.50 0.6 undecidable manual P 272 53.8017 50 0.2 45
IV.PIGN.HHZ. 2021-12-23T02:33:16.07 0.3 undecidable manual P 149 44.9217 50 0.14 69
IV.POFI.HHZ. 2021-12-23T02:33:16.73 0.3 undecidable manual S 320 24.6531 50 0.04 73
IV.VVLD.HHZ. 2021-12-23T02:33:15.21 0.1 undecidable manual P 327 42.624 50 -0.37 89
IV.SGG.HHZ. 2021-12-23T02:33:15.78 0.3 undecidable manual P 114 43.4232 50 0.07 71
IV.MIDA.HHZ. 2021-12-23T02:33:13.21 0.1 undecidable manual P 70 31.0467 50 -0.59 85
IV.CERA.HHZ. 2021-12-23T02:33:13.33 0.6 undecidable manual S 60 11.1777 133 0.52 45
IV.LRP.EHN. 2021-12-23T02:33:13.80 0.3 undecidable manual P 293 28.4493 50 0.4 68
IV.RNI2.HHZ. 2021-12-23T02:33:13.26 0.1 positive manual P 50 27.0507 50 0.08 97
IV.VAGA.HHZ. 2021-12-23T02:33:13.58 0.3 undecidable manual P 118 31.2465 50 -0.25 70
IV.POFI.HHZ. 2021-12-23T02:33:12.56 0.3 undecidable manual P 320 24.6531 50 -0.25 70
IV.MCI.EHZ. 2021-12-23T02:33:12.47 0.6 undecidable manual S 230 9.6792 137 0.04 50
IT.OPI.HGE. 2021-12-23T02:33:12.92 0.3 undecidable manual P 347 26.1516 50 -0.12 72
IV.MCI.EHZ. 2021-12-23T02:33:10.26 0.1 positive manual P 230 9.6792 137 -0.09 99
IV.CERA.HHZ. 2021-12-23T02:33:10.52 0.1 undecidable manual P 60 11.1777 133 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MCI.EHE. ML:2.3 0.0023049999999999998 1.76 AML other m 2021-12-23T02:33:12.96
IV.CERA.HNN. ML:1.5 0.00034950000000000004 0.9 AML other m 2021-12-23T02:33:14.61
IV.CERA.HHN. ML:1.5 0.0003625 0.9 AML other m 2021-12-23T02:33:14.61
IV.MCI.EHN. ML:1.8 0.0009445 0.18 AML other m 2021-12-23T02:33:14.15
IV.CERA.HNE. ML:1.6 0.0004195 0.5 AML other m 2021-12-23T02:33:15.55
IV.CERA.HHE. ML:1.6 0.0004215 0.5 AML other m 2021-12-23T02:33:15.55
IV.POFI.HHE. ML:1.2 0.000084 0.38 AML other m 2021-12-23T02:33:17.13
IV.POFI.HHN. ML:1.0 0.00006085 0.66 AML other m 2021-12-23T02:33:17.32
IV.VAGA.HNE. ML:1.4 0.0001233 1.34 AML other m 2021-12-23T02:33:19.89
IV.VAGA.HHE. ML:1.4 0.00011209999999999999 1.08 AML other m 2021-12-23T02:33:20.89
IV.VVLD.HHN. ML:1.4 0.0000737 0.42 AML other m 2021-12-23T02:33:21.91
IV.RNI2.HHN. ML:1.1 0.00007625000000000001 0.76 AML other m 2021-12-23T02:33:22.46
IV.VAGA.HHN. ML:1.6 0.000194 0.26 AML other m 2021-12-23T02:33:22.54
IV.VVLD.HHE. ML:1.4 0.0000784 0.2 AML other m 2021-12-23T02:33:23.50
IV.VAGA.HNN. ML:1.7 0.000227 0.4 AML other m 2021-12-23T02:33:23.27
IV.RNI2.HHE. ML:1.3 0.000101 1.22 AML other m 2021-12-23T02:33:23.68
IV.SGG.HHN. ML:1.4 0.00007485 0.4 AML other m 2021-12-23T02:33:23.65
IV.SGG.HHE. ML:1.4 0.0000861 0.46 AML other m 2021-12-23T02:33:24.19
IV.PIGN.HHN. ML:1.2 0.00004685 1.32 AML other m 2021-12-23T02:33:25.07
IV.MIDA.HHN. ML:1.1 0.0000618 0.26 AML other m 2021-12-23T02:33:25.33
IV.MIDA.HHE. ML:1.1 0.00005805 0.76 AML other m 2021-12-23T02:33:25.47
IV.PIGN.HHE. ML:1.2 0.000051250000000000006 0.6 AML other m 2021-12-23T02:33:26.51
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