Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 23-12-2021 and time 02:29:24 (UTC) in region 2 km S Vallerotonda (FR)

A magnitude ML 1.3 earthquake occured in region: 2 km S Vallerotonda (FR), on

  • 23-12-2021 02:29:24 (UTC)
  • 23-12-2021 03:29:24 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.5340, 13.9080 at 11 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 2 1581 1581
Sant'Elia Fiumerapido FR 4 6166 7747
Acquafondata FR 4 263 8010
Viticuso FR 5 353 8363
Cervaro FR 6 8109 16472
Cassino FR 8 36142 52614
San Vittore del Lazio FR 8 2636 55250
San Biagio Saracinisco FR 9 349 55599
Conca Casale IS 9 200 55799
Belmonte Castello FR 9 739 56538
San Pietro Infine CE 11 944 57482
Villa Latina FR 11 1241 58723
Terelle FR 11 422 59145
Villa Santa Lucia FR 12 2632 61777
Filignano IS 13 648 62425
Venafro IS 13 11280 73705
Picinisco FR 13 1218 74923
Atina FR 13 4316 79239
Pozzilli IS 13 2380 81619
Piedimonte San Germano FR 14 6535 88154
Pignataro Interamna FR 15 2595 90749
Rocca d'Evandro CE 15 3283 94032
Scapoli IS 16 680 94712
Mignano Monte Lungo CE 16 3250 97962
Sant'Apollinare FR 16 1919 99881
Settefrati FR 16 728 100609
Sant'Ambrogio sul Garigliano FR 16 966 101575
Gallinaro FR 17 1269 102844
Aquino FR 18 5370 108214
Castrocielo FR 18 3965 112179
Colle San Magno FR 18 699 112878
Montaquila IS 18 2456 115334
Colli a Volturno IS 18 1349 116683
Casalattico FR 18 574 117257
Rocchetta a Volturno IS 18 1113 118370
San Giorgio a Liri FR 18 3164 121534
Pizzone IS 18 329 121863
Castel San Vincenzo IS 19 516 122379
Sesto Campano IS 19 2388 124767
Sant'Andrea del Garigliano FR 19 1505 126272
Casalvieri FR 20 2698 128970
Roccasecca FR 20 7365 136335

Municipalities with at least 50000 inhabitants

An earthquake occurred to
62 Km NW of Caserta (76326 inhabitants)
67 Km NW of Aversa (53047 inhabitants)
72 Km NW of Giugliano in Campania (122974 inhabitants)
74 Km NW of Marano di Napoli (59874 inhabitants)
76 Km NW of Afragola (65057 inhabitants)
76 Km NW of Acerra (59573 inhabitants)
77 Km NW of Casoria (77642 inhabitants)
78 Km N of Pozzuoli (81661 inhabitants)
82 Km NW of Napoli (974074 inhabitants)
84 Km E of Latina (125985 inhabitants)
86 Km NW of Benevento (60091 inhabitants)
87 Km NW of Portici (55274 inhabitants)
88 Km NW of Ercolano (53709 inhabitants)
91 Km NW of Torre del Greco (86275 inhabitants)
94 Km S of Chieti (51815 inhabitants)
95 Km E of Velletri (53303 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 1.3 2021-12-23
02:29:24		 41.5338 13.9075 11 2022-03-30
13:04:42		 Bollettino Sismico Italiano INGV 102360451
Reviewed
Rev100 		ML 1.3 2021-12-23
02:29:23		 41.5337 13.8963 14 2021-12-23
02:58:21		 Sala Sismica INGV-Roma 98836881
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-23 02:29:24 ± 0.09
Latitude 41.5338 ± 0.0072
Longitude 13.9075 ± 0.0060
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 102360451

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 803
Semi-minor axis of confidence ellipse (meter) 507
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 182
Circular confidence region, given by single value of horizontal uncertainty (meter) 800.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 123
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.08274
Epicentral distance of station farthest from the epicenter (degree) 0.39660
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 102360451
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-25 09:56:25

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 98836881
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-23 02:58:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VVLD.HHZ. 2021-12-23T02:29:38.27 0.6 undecidable manual S 328 44.0226 90 -0.07 46
IV.LRP.EHN. 2021-12-23T02:29:35.06 0.6 undecidable manual S 295 29.4483 90 0.63 43
IV.MIDA.HHZ. 2021-12-23T02:29:35.33 0.6 undecidable manual S 67 31.1466 90 0.44 45
IT.OPI.HGE. 2021-12-23T02:29:33.97 0.6 undecidable manual S 347 27.6501 90 0.01 48
IV.POFI.HHZ. 2021-12-23T02:29:33.47 0.6 undecidable manual S 322 26.0517 90 -0.05 47
IV.SGG.HHZ. 2021-12-23T02:29:32.36 0.3 undecidable manual P 112 42.4242 90 0.28 68
IV.VVLD.HHZ. 2021-12-23T02:29:31.88 0.3 undecidable manual P 328 44.0226 90 -0.45 64
IV.VAGA.HHZ. 2021-12-23T02:29:30.07 0.3 undecidable manual P 116 30.1476 90 -0.11 71
IV.CERA.HHZ. 2021-12-23T02:29:30.04 0.3 undecidable manual S 52 11.5773 111 0.35 70
IV.LRP.EHN. 2021-12-23T02:29:30.31 0.3 undecidable manual P 295 29.4483 90 0.24 70
IV.POFI.HHZ. 2021-12-23T02:29:29.53 0.1 undecidable manual P 322 26.0517 90 -0.02 96
IV.MCI.EHZ. 2021-12-23T02:29:29.25 0.6 undecidable manual S 239 9.1797 124 0.14 48
IV.RNI2.HHZ. 2021-12-23T02:29:29.82 0.1 undecidable manual P 47 27.6501 90 0.02 97
IT.OPI.HGE. 2021-12-23T02:29:29.60 0.3 undecidable manual P 347 27.6501 90 -0.2 69
IV.MIDA.HHZ. 2021-12-23T02:29:29.92 0.1 undecidable manual P 67 31.1466 90 -0.42 88
IV.CERA.HHZ. 2021-12-23T02:29:27.20 0.1 undecidable manual P 52 11.5773 111 -0.14 98
IV.MCI.EHZ. 2021-12-23T02:29:26.88 0.1 undecidable manual P 239 9.1797 124 -0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MCI.EHE. ML:2.2 0.00202 0.26 AML other m 2021-12-23T02:29:30.03
IV.MCI.EHN. ML:1.8 0.000717 1.16 AML other m 2021-12-23T02:29:30.02
IV.CERA.HHN. ML:1.3 0.00022999999999999998 0.24 AML other m 2021-12-23T02:29:31.90
IV.CERA.HNN. ML:1.3 0.00023549999999999998 0.82 AML other m 2021-12-23T02:29:31.79
IV.CERA.HNE. ML:1.3 0.00022399999999999997 1.78 AML other m 2021-12-23T02:29:31.99
IV.CERA.HHE. ML:1.3 0.00022999999999999998 1.78 AML other m 2021-12-23T02:29:31.99
IV.POFI.HHE. ML:0.9 0.00004235 0.4 AML other m 2021-12-23T02:29:34.94
IV.POFI.HHN. ML:0.9 0.00003995 0.42 AML other m 2021-12-23T02:29:35.07
IV.VAGA.HHE. ML:1.2 0.0000815 1.06 AML other m 2021-12-23T02:29:37.93
IV.MIDA.HHN. ML:1.0 0.00004795 0.48 AML other m 2021-12-23T02:29:37.41
IV.MIDA.HHE. ML:1.1 0.000054749999999999996 1.24 AML other m 2021-12-23T02:29:37.66
IV.MIDA.HNN. ML:1.7 0.00023295000000000002 0.42 AML other m 2021-12-23T02:29:37.67
IV.VAGA.HHN. ML:1.6 0.0001705 0.2 AML other m 2021-12-23T02:29:38.55
IV.VVLD.HHE. ML:1.2 0.000048549999999999994 0.3 AML other m 2021-12-23T02:29:38.89
IV.MIDA.HNE. ML:1.2 0.0000635 1.1 AML other m 2021-12-23T02:29:39.29
IV.SGG.HHN. ML:1.3 0.00005855000000000001 0.42 AML other m 2021-12-23T02:29:40.34
IV.VVLD.HHN. ML:1.1 0.00004045 0.46 AML other m 2021-12-23T02:29:40.89
IV.SGG.HHE. ML:1.2 0.000052199999999999995 0.48 AML other m 2021-12-23T02:29:45.68
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