Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 23-12-2021 and time 01:55:28 (UTC) in region 1 km W Vallerotonda (FR)

A magnitude ML 1.5 earthquake occured in region: 1 km W Vallerotonda (FR), on

  • 23-12-2021 01:55:28 (UTC)
  • 23-12-2021 02:55:28 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.5480, 13.8990 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.

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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
Vallerotonda FR 1 1581 1581
Sant'Elia Fiumerapido FR 3 6166 7747
Acquafondata FR 5 263 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 11 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
Piedimonte San Germano FR 14 6535 74494
Venafro IS 14 11280 85774
Pozzilli IS 14 2380 88154
Settefrati FR 14 728 88882
Gallinaro FR 15 1269 90151
Pignataro Interamna FR 15 2595 92746
Scapoli IS 15 680 93426
Casalattico FR 17 574 94000
Castrocielo FR 17 3965 97965
Rocca d'Evandro CE 17 3283 101248
Colle San Magno FR 17 699 101947
Sant'Apollinare FR 17 1919 103866
Mignano Monte Lungo CE 17 3250 107116
Aquino FR 17 5370 112486
Pizzone IS 18 329 112815
Sant'Ambrogio sul Garigliano FR 18 966 113781
Rocchetta a Volturno IS 18 1113 114894
Casalvieri FR 18 2698 117592
Colli a Volturno IS 18 1349 118941
Castel San Vincenzo IS 18 516 119457
Montaquila IS 18 2456 121913
Roccasecca FR 19 7365 129278
San Giorgio a Liri FR 19 3164 132442
San Donato Val di Comino FR 19 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)
78 Km NW of Afragola (65057 inhabitants)
78 Km NW of Acerra (59573 inhabitants)
79 Km NW of Casoria (77642 inhabitants)
80 Km N of Pozzuoli (81661 inhabitants)
83 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 1.5 2021-12-23
01:55:28		 41.5482 13.899 10 2022-03-30
13:04:36		 Bollettino Sismico Italiano INGV 100803001
Reviewed
Rev100 		ML 1.6 2021-12-23
01:55:28		 41.5455 13.8927 10 2021-12-23
02:03:29		 Sala Sismica INGV-Roma 98835071
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-23 01:55:28 ± 0.05
Latitude 41.5482 ± 0.0036
Longitude 13.8990 ± 0.0036
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 100803001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 381
Semi-minor axis of confidence ellipse (meter) 274
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 195
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 79
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
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) 0.08633
Epicentral distance of station farthest from the epicenter (degree) 0.54139
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 39
Type of magnitude ML
Reference to an origin 100803001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-09 11:08:56

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 98835071
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-23 02:03:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.LPEL.HHZ. 2021-12-23T01:55:47.31 0.6 undecidable manual S 23 60.0954 50 0.15 45
IV.SGG.HHZ. 2021-12-23T01:55:43.16 0.3 undecidable manual S 114 43.7229 50 0.37 66
IV.VVLD.HHZ. 2021-12-23T01:55:42.49 0.3 undecidable manual S 327 42.3243 50 0.07 70
IV.LPEL.HHZ. 2021-12-23T01:55:39.31 0.6 undecidable manual P 23 60.0954 50 0.05 46
IV.MIDA.HHZ. 2021-12-23T01:55:39.71 0.6 undecidable manual S 70 31.2465 50 0.26 46
IV.VAGA.HHZ. 2021-12-23T01:55:39.63 0.6 undecidable manual S 118 31.5462 50 0.1 47
IV.LRP.EHZ. 2021-12-23T01:55:38.95 0.6 undecidable manual S 293 28.1496 50 0.32 46
IV.GIUL.HHZ. 2021-12-23T01:55:38.17 0.3 undecidable manual P 271 53.502 50 -0.08 69
IV.RNI2.HHZ. 2021-12-23T01:55:38.36 0.3 undecidable manual S 51 27.1506 50 -0.01 73
IT.OPI.HGZ. 2021-12-23T01:55:38.19 0.3 undecidable manual S 347 25.9518 50 0.15 71
IV.POFI.HHZ. 2021-12-23T01:55:37.63 0.3 undecidable manual S 321 24.3534 50 0.01 73
IV.PIGN.HHZ. 2021-12-23T01:55:37.10 0.3 undecidable manual P 149 45.1215 50 0.14 69
IV.VVLD.HHZ. 2021-12-23T01:55:36.21 0.1 undecidable manual P 327 42.3243 50 -0.32 89
IV.SGG.HHZ. 2021-12-23T01:55:36.63 0.3 undecidable manual P 114 43.7229 50 -0.12 69
IV.VAGA.HHZ. 2021-12-23T01:55:34.54 0.3 undecidable manual P 118 31.5462 50 -0.32 68
IV.RNI2.HHZ. 2021-12-23T01:55:34.13 0.1 undecidable manual P 51 27.1506 50 -0.06 96
IV.CERA.HHZ. 2021-12-23T01:55:34.00 0.3 undecidable manual S 61 11.2776 132 0.21 72
IV.MIDA.HHZ. 2021-12-23T01:55:34.39 0.1 undecidable manual P 70 31.2465 50 -0.43 89
IV.LRP.EHZ. 2021-12-23T01:55:34.41 0.3 undecidable manual P 293 28.1496 50 0.07 72
IV.POFI.HHZ. 2021-12-23T01:55:33.84 0.1 undecidable manual P 321 24.3534 50 0.09 96
IV.MCI.EHZ. 2021-12-23T01:55:33.56 0.3 undecidable manual S 228 9.5793 137 0.21 72
IT.OPI.HGZ. 2021-12-23T01:55:33.83 0.3 undecidable manual P 347 25.9518 50 -0.17 71
IV.MCI.EHZ. 2021-12-23T01:55:31.16 0.1 undecidable manual P 228 9.5793 137 -0.13 98
IV.CERA.HHZ. 2021-12-23T01:55:31.53 0.1 positive manual P 61 11.2776 132 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MCI.EHE. ML:2.6 0.005640000000000001 1.72 AML other m 2021-12-23T01:55:33.98
IV.MCI.EHN. ML:2.2 0.001885 0.18 AML other m 2021-12-23T01:55:35.26
IV.CERA.HHE. ML:1.7 0.0006000652 0.24 AML other m 2021-12-23T01:55:35.52
IV.CERA.HNE. ML:1.7 0.0005797552 0.24 AML other m 2021-12-23T01:55:35.52
IV.CERA.HHN. ML:1.7 0.0005738012 0.2592 AML other m 2021-12-23T01:55:35.60
IV.CERA.HNN. ML:1.6 0.0005469619999999999 0.2496 AML other m 2021-12-23T01:55:35.61
IV.POFI.HHE. ML:1.1 0.00007827342000000002 0.3392 AML other m 2021-12-23T01:55:38.17
IV.POFI.HNE. ML:1.4 0.0001584275 0.5008 AML other m 2021-12-23T01:55:38.20
IV.POFI.HHN. ML:1.1 0.0000737 0.18 AML other m 2021-12-23T01:55:38.37
IV.POFI.HNN. ML:1.4 0.0001472315 0.68 AML other m 2021-12-23T01:55:39.57
IV.LRP.EHE. ML:1.5 0.0001595 1.76 AML other m 2021-12-23T01:55:40.96
IV.VAGA.HHE. ML:1.6 0.00020613408 0.2192 AML other m 2021-12-23T01:55:40.88
IV.VAGA.HNE. ML:1.6 0.00019856610000000002 0.2208 AML other m 2021-12-23T01:55:40.89
IV.MIDA.HHE. ML:1.3 0.000098378065 0.32 AML other m 2021-12-23T01:55:41.76
IV.VAGA.HHN. ML:1.9 0.00039976314999999997 0.2 AML other m 2021-12-23T01:55:42.50
IV.VAGA.HNN. ML:1.9 0.00039547875 0.1888 AML other m 2021-12-23T01:55:42.50
IV.VVLD.HNE. ML:1.6 0.00012680406499999999 0.4992 AML other m 2021-12-23T01:55:42.87
IV.RNI2.HHN. ML:1.5 0.00016758040000000002 0.32 AML other m 2021-12-23T01:55:43.51
IV.RNI2.HNN. ML:1.5 0.000172343605 0.3296 AML other m 2021-12-23T01:55:43.52
IV.LRP.EHN. ML:0.9 0.000041599999999999995 0.72 AML other m 2021-12-23T01:55:43.59
IV.SGG.HHN. ML:1.7 0.0001477697 0.7792 AML other m 2021-12-23T01:55:43.70
IV.SGG.HNN. ML:1.8 0.0001731239 0.4592 AML other m 2021-12-23T01:55:44.62
IV.VVLD.HHE. ML:1.5 0.00009553623999999999 0.1792 AML other m 2021-12-23T01:55:44.45
IV.MIDA.HNN. ML:1.6 0.00019020124999999998 0.7408 AML other m 2021-12-23T01:55:44.94
IV.VVLD.HHN. ML:1.3 0.00006417509000000001 0.2592 AML other m 2021-12-23T01:55:45.34
IV.MIDA.HHN. ML:1.4 0.00011949999999999999 0.22 AML other m 2021-12-23T01:55:46.32
IV.MIDA.HNE. ML:1.4 0.00012962045 0.2416 AML other m 2021-12-23T01:55:46.32
IV.RNI2.HHE. ML:1.6 0.000216 0.26 AML other m 2021-12-23T01:55:46.89
IV.RNI2.HNE. ML:1.6 0.000219097 0.6112 AML other m 2021-12-23T01:55:46.90
IV.PIGN.HNN. ML:1.4 0.00008059604500000001 0.3504 AML other m 2021-12-23T01:55:47.40
IV.PIGN.HHN. ML:1.5 0.00008315 0.34 AML other m 2021-12-23T01:55:47.41
IV.PIGN.HHE. ML:1.5 0.00008378143999999999 0.4 AML other m 2021-12-23T01:55:47.83
IV.PIGN.HNE. ML:1.5 0.0000922101 0.4112 AML other m 2021-12-23T01:55:47.84
IV.SGG.HHE. ML:1.6 0.00012588955 0.5008 AML other m 2021-12-23T01:55:49.62
IV.GIUL.HHE. ML:1.1 0.00003105 1.5 AML other m 2021-12-23T01:55:51.18
IV.GIUL.HHN. ML:1.3 0.0000461 0.22 AML other m 2021-12-23T01:55:51.30
IV.LPEL.HHN. ML:1.5 0.000069085085 0.16 AML other m 2021-12-23T01:55:51.64
IV.VVLD.HNN. ML:1.5 0.000105982885 0.68 AML other m 2021-12-23T01:55:51.00
IV.LPEL.HHE. ML:1.5 0.000067871075 0.2592 AML other m 2021-12-23T01:55:53.02
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