Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 20-12-2021 and time 23:04:40 (Italy) in region 5 km W Gioia Sannitica (CE)

A magnitude ML 1.8 earthquake occured in region: 5 km W Gioia Sannitica (CE), on

  • 20-12-2021 22:04:40 (UTC)
  • 20-12-2021 23:04:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.2940, 14.3890 at 8 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
Gioia Sannitica CE 5 3638 3638
San Potito Sannitico CE 5 1925 5563
Alife CE 6 7616 13179
Alvignano CE 7 4824 18003
Dragoni CE 7 2108 20111
Piedimonte Matese CE 7 11297 31408
Faicchio BN 8 3634 35042
Castello del Matese CE 8 1494 36536
Ruviano CE 9 1655 38191
Puglianello BN 10 1349 39540
San Gregorio Matese CE 10 988 40528
San Salvatore Telesino BN 11 3999 44527
Cusano Mutri BN 11 4091 48618
Amorosi BN 12 2797 51415
Baia e Latina CE 12 2197 53612
Liberi CE 12 1153 54765
San Lorenzello BN 13 2227 56992
Caiazzo CE 13 5595 62587
Sant'Angelo d'Alife CE 13 2270 64857
Castel Campagnano CE 14 1581 66438
Castel di Sasso CE 14 1171 67609
Roccaromana CE 14 856 68465
Cerreto Sannita BN 14 3940 72405
Telese Terme BN 15 7486 79891
Piana di Monte Verna CE 15 2390 82281
Castelvenere BN 15 2562 84843
Pietraroja BN 15 545 85388
Raviscanina CE 15 1319 86707
Formicola CE 16 1488 88195
Pontelatone CE 16 1703 89898
Limatola BN 17 4073 93971
Pietramelara CE 17 4722 98693
Melizzano BN 18 1858 100551
Solopaca BN 18 3820 104371
Guardia Sanframondi BN 18 5078 109449
Valle Agricola CE 18 890 110339
Dugenta BN 18 2798 113137
Ailano CE 19 1369 114506
Pietravairano CE 19 2984 117490
Giano Vetusto CE 19 647 118137
Frasso Telesino BN 19 2318 120455
Camigliano CE 19 1943 122398
Castel Morrone CE 19 3858 126256
Bellona CE 20 6053 132309
Campochiaro CB 20 646 132955
Pastorano CE 20 3033 135988

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km N of Caserta (76326 inhabitants)
38 Km NW of Benevento (60091 inhabitants)
39 Km N of Acerra (59573 inhabitants)
39 Km NE of Aversa (53047 inhabitants)
42 Km N of Afragola (65057 inhabitants)
44 Km NE of Giugliano in Campania (122974 inhabitants)
44 Km N of Casoria (77642 inhabitants)
47 Km NE of Marano di Napoli (59874 inhabitants)
52 Km N of Napoli (974074 inhabitants)
52 Km N of Portici (55274 inhabitants)
54 Km N of Ercolano (53709 inhabitants)
54 Km NW of Avellino (54857 inhabitants)
56 Km NE of Pozzuoli (81661 inhabitants)
56 Km N of Torre del Greco (86275 inhabitants)
62 Km N of Scafati (50787 inhabitants)
67 Km N of Castellammare di Stabia (66466 inhabitants)
71 Km NW of Cava de' Tirreni (53659 inhabitants)
75 Km NW of Salerno (135261 inhabitants)
91 Km NW of Battipaglia (50786 inhabitants)
94 Km W of San Severo (53905 inhabitants)
98 Km W of Foggia (151991 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 1.8 2021-12-20
22:04:40		 41.2942 14.3887 8 2022-03-30
13:04:34		 Bollettino Sismico Italiano INGV 100504471
Reviewed
Rev100 		ML 1.8 2021-12-20
22:04:40		 41.2917 14.388 7 2021-12-20
22:50:40		 Sala Sismica INGV-Roma 98768361
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-20 22:04:40 ± 0.09
Latitude 41.2942 ± 0.0054
Longitude 14.3887 ± 0.0072
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 100504471

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 604
Semi-minor axis of confidence ellipse (meter) 120
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 214
Circular confidence region, given by single value of horizontal uncertainty (meter) 600.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 71
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) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.09263
Epicentral distance of station farthest from the epicenter (degree) 0.66010
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 98768361
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-20 22:50:40

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 100504471
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-23 08:02:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PAOL.HHZ. 2021-12-20T22:04:52.48 0.6 undecidable manual S 153 32.745 104 0.64 41
IV.POFI.HNE. 2021-12-20T22:04:52.70 1.0 undecidable manual P 310 73.2711 50 -0.52 20
IV.SACR.HHZ. 2021-12-20T22:04:51.20 0.6 undecidable manual S 66 28.749 106 0.71 40
IV.MRB1.HHZ. 2021-12-20T22:04:50.09 0.3 undecidable manual P 111 52.0035 50 0.15 69
IV.VVDG.HHE. 2021-12-20T22:04:50.70 0.3 undecidable manual P 177 50.9157 50 0.91 54
IV.TST01.HHE. 2021-12-20T22:04:49.93 0.6 undecidable manual P 360 50.4162 50 0.22 45
IV.RNI2.HHN. 2021-12-20T22:04:49.69 0.3 undecidable manual P 337 49.4172 50 0.13 70
IV.GATE.HNN. 2021-12-20T22:04:49.68 0.3 undecidable manual P 61 49.7169 50 0.08 70
IV.VITU.HHZ. 2021-12-20T22:04:48.74 0.6 undecidable manual S 121 23.6541 109 -0.03 50
IV.CERA.HNE. 2021-12-20T22:04:48.82 0.3 undecidable manual P 318 45.621 50 -0.15 69
IV.MIDA.HHZ. 2021-12-20T22:04:47.67 0.3 undecidable manual P 344 40.1265 50 -0.46 65
IV.VAGA.HHZ. 2021-12-20T22:04:47.37 0.6 undecidable manual S 316 18.5703 113 0.22 48
IV.PIGN.HHZ. 2021-12-20T22:04:47.76 0.6 undecidable manual S 239 20.2686 112 0.06 49
IV.PSB1.HHE. 2021-12-20T22:04:47.80 0.3 undecidable manual P 102 36.0417 50 0.3 69
IV.PAOL.HHZ. 2021-12-20T22:04:46.34 0.3 undecidable manual P 153 32.745 104 -0.54 65
IV.BSSO.HHZ. 2021-12-20T22:04:46.66 0.3 undecidable manual P 31 32.745 104 -0.22 70
IV.SGG.HHZ. 2021-12-20T22:04:45.20 0.6 undecidable manual S 356 10.2786 128 0.56 44
IV.SACR.HHZ. 2021-12-20T22:04:45.82 0.1 undecidable manual P 66 28.749 106 -0.29 93
IV.PTRJ.HHZ. 2021-12-20T22:04:45.83 0.6 undecidable manual S 56 14.0748 120 0.1 49
IV.VAGA.HHZ. 2021-12-20T22:04:44.26 0.3 undecidable manual P 316 18.5703 113 0.08 74
IV.PIGN.HHZ. 2021-12-20T22:04:44.37 0.1 undecidable manual P 239 20.2686 112 -0.13 97
IV.VITU.HHZ. 2021-12-20T22:04:44.58 0.1 undecidable manual P 121 23.6541 109 -0.54 88
IV.PTRJ.HHZ. 2021-12-20T22:04:43.05 0.3 undecidable manual P 56 14.0748 120 -0.31 71
IV.SGG.HHZ. 2021-12-20T22:04:42.79 0.1 undecidable manual P 356 10.2786 128 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SGG.HNN. ML:1.9 0.0010831152 0.1664 AML other m 2021-12-20T22:04:46.07
IV.SGG.HHN. ML:1.9 0.00113375095 0.1536 AML other m 2021-12-20T22:04:46.08
IV.SGG.HNE. ML:1.8 0.0009434314 1.5392 AML other m 2021-12-20T22:04:46.85
IV.SGG.HHE. ML:1.8 0.0008925073 0.3584 AML other m 2021-12-20T22:04:48.59
IV.VITU.HHE. ML:2.0 0.0006925 0.4 AML other m 2021-12-20T22:04:49.48
IV.PIGN.HHE. ML:1.7 0.0003525 0.42 AML other m 2021-12-20T22:04:50.63
IV.VAGA.HNN. ML:2.0 0.0008280000000000001 1.12 AML other m 2021-12-20T22:04:50.90
IV.VAGA.HHN. ML:2.0 0.000865 1.12 AML other m 2021-12-20T22:04:50.90
IV.VITU.HNN. ML:2.0 0.0007455000000000001 1.72 AML other m 2021-12-20T22:04:51.07
IV.VITU.HHN. ML:2.1 0.000799 0.24 AML other m 2021-12-20T22:04:51.07
IV.VITU.HNE. ML:1.6 0.000257 1.36 AML other m 2021-12-20T22:04:51.09
IV.PIGN.HNE. ML:1.6 0.0003095 0.78 AML other m 2021-12-20T22:04:52.09
IV.SACR.HHE. ML:1.6 0.000188 1.02 AML other m 2021-12-20T22:04:52.63
IV.PAOL.HHE. ML:2.0 0.000447 0.32 AML other m 2021-12-20T22:04:53.02
IV.SACR.HHN. ML:1.5 0.00016999999999999999 1.24 AML other m 2021-12-20T22:04:53.21
IV.PIGN.HNN. ML:1.6 0.000306 0.26 AML other m 2021-12-20T22:04:53.57
IV.PIGN.HHN. ML:1.6 0.00031000000000000005 0.24 AML other m 2021-12-20T22:04:53.57
IV.BSSO.HNE. ML:1.8 0.0002585 0.48 AML other m 2021-12-20T22:04:54.67
IV.BSSO.HHE. ML:1.7 0.0002415 0.48 AML other m 2021-12-20T22:04:54.67
IV.VAGA.HNE. ML:1.8 0.0005505 0.28 AML other m 2021-12-20T22:04:55.23
IV.VAGA.HHE. ML:1.8 0.0005735 0.26 AML other m 2021-12-20T22:04:55.23
IV.PAOL.HHN. ML:1.9 0.000327 0.26 AML other m 2021-12-20T22:04:58.24
IV.MIDA.HHE. ML:1.4 0.00009435 0.44 AML other m 2021-12-20T22:04:59.11
IV.BSSO.HHN. ML:1.5 0.00014749999999999998 1.58 AML other m 2021-12-20T22:05:00.94
IV.BSSO.HNN. ML:1.6 0.00016299999999999998 1.58 AML other m 2021-12-20T22:05:00.95
IV.MIDA.HHN. ML:1.6 0.0001271 0.86 AML other m 2021-12-20T22:05:00.54
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