Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 20-12-2020 and time 08:42:59 (UTC) in region 3 km SW Colli a Volturno (IS)

A magnitude ML 0.8 earthquake occured in region: 3 km SW Colli a Volturno (IS), on

  • 20-12-2020 08:42:59 (UTC)
  • 20-12-2020 09:42:59 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.5810, 14.0800 at 9 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Colli a Volturno IS 3 1349 1349
Montaquila IS 4 2456 3805
Scapoli IS 4 680 4485
Filignano IS 4 648 5133
Rocchetta a Volturno IS 5 1113 6246
Fornelli IS 6 1909 8155
Macchia d'Isernia IS 8 1035 9190
Pozzilli IS 8 2380 11570
Cerro al Volturno IS 8 1281 12851
Castel San Vincenzo IS 8 516 13367
Monteroduni IS 10 2264 15631
Pizzone IS 10 329 15960
Venafro IS 11 11280 27240
Viticuso FR 11 353 27593
Acquafondata FR 11 263 27856
Conca Casale IS 11 200 28056
Acquaviva d'Isernia IS 12 425 28481
Isernia IS 12 21842 50323
Sant'Agapito IS 13 1496 51819
San Biagio Saracinisco FR 13 349 52168
Capriati a Volturno CE 14 1541 53709
Vallerotonda FR 14 1581 55290
Montenero Val Cocchiara IS 15 538 55828
Longano IS 15 690 56518
Forlì del Sannio IS 15 675 57193
Rionero Sannitico IS 16 1118 58311
Miranda IS 16 1047 59358
Ciorlano CE 16 426 59784
Fontegreca CE 16 811 60595
Pettoranello del Molise IS 17 460 61055
Pesche IS 17 1661 62716
Alfedena AQ 18 864 63580
San Vittore del Lazio FR 18 2636 66216
Sesto Campano IS 18 2388 68604
Gallo Matese CE 18 579 69183
San Pietro Infine CE 18 944 70127
Cervaro FR 18 8109 78236
Roccasicura IS 18 550 78786
Sant'Elia Fiumerapido FR 18 6166 84952
Scontrone AQ 19 574 85526
Castelpizzuto IS 19 155 85681
Picinisco FR 19 1218 86899
Prata Sannita CE 20 1502 88401

Municipalities with at least 50000 inhabitants

An earthquake occurred to
60 Km NW of Caserta (76326 inhabitants)
68 Km N of Aversa (53047 inhabitants)
73 Km N of Giugliano in Campania (122974 inhabitants)
75 Km NW of Acerra (59573 inhabitants)
76 Km N of Afragola (65057 inhabitants)
76 Km N of Marano di Napoli (59874 inhabitants)
77 Km NW of Benevento (60091 inhabitants)
77 Km N of Casoria (77642 inhabitants)
82 Km N of Pozzuoli (81661 inhabitants)
84 Km N of Napoli (974074 inhabitants)
86 Km S of Chieti (51815 inhabitants)
87 Km N of Portici (55274 inhabitants)
89 Km N of Ercolano (53709 inhabitants)
91 Km N of Torre del Greco (86275 inhabitants)
95 Km NW of Avellino (54857 inhabitants)
99 Km E of Latina (125985 inhabitants)
99 Km S of Pescara (121014 inhabitants)
100 Km NW of Scafati (50787 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
Reviewed
Rev100 		ML 0.8 2020-12-20
08:42:59		 41.5813 14.0798 9 2020-12-20
08:51:30		 Sala Sismica INGV-Roma 85572771
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-20 08:42:59 ± 0.23
Latitude 41.5813 ± 0.0054
Longitude 14.0798 ± 0.0072
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85572771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 550
Semi-minor axis of confidence ellipse (meter) 405
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 181
Circular confidence region, given by single value of horizontal uncertainty (meter) 550.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 101
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 9
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) 0.21943
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.1
Num. used stations 10
Type of magnitude ML
Reference to an origin 85572771
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-20 08:51:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MILZ.HHZ. 2020-12-20T08:44:49.59 3.0 undecidable manual Sg 14.58 0
IV.CAGR.HHZ. 2020-12-20T08:44:47.73 3.0 undecidable manual Sn 0.12 0
IV.NDIM.HHZ. 2020-12-20T08:44:40.15 3.0 undecidable manual Sn 0.34 0
IV.FIR.HHZ. 2020-12-20T08:44:26.54 3.0 undecidable manual Sg 11.81 0
IV.USI.HHZ. 2020-12-20T08:44:22.33 3.0 undecidable manual Sn 1.05 0
IV.ORI.HHZ. 2020-12-20T08:44:10.38 3.0 undecidable manual Sn 0.13 0
IV.MAON.HHZ. 2020-12-20T08:44:09.01 3.0 undecidable manual Sg 10.49 0
IV.CAGR.HHZ. 2020-12-20T08:44:06.42 3.0 undecidable manual Pg 7.45 0
ST.VARA.EHZ. 2020-12-20T08:44:05.78 3.0 undecidable manual Pn 0.21 0
IV.COR1.EHZ. 2020-12-20T08:43:58.31 3.0 undecidable manual Sg 2.82 0
IV.NARO.HHZ. 2020-12-20T08:43:57.68 3.0 undecidable manual Sg -0.14 0
IV.MPNC.HHZ. 2020-12-20T08:43:57.22 3.0 undecidable manual Pn 3.3 0
IV.ATPI.EHZ. 2020-12-20T08:43:52.94 3.0 undecidable manual Sg -3.02 0
IV.TOLF.HHZ. 2020-12-20T08:43:40.65 3.0 undecidable manual Sn -0.25 0
IV.PE3.EHZ. 2020-12-20T08:43:40.52 3.0 positive manual Pg 8.1 0
IV.MNTT.EHZ. 2020-12-20T08:43:21.27 3.0 undecidable manual P 0.54 0
IX.MNT3.HHZ.02 2020-12-20T08:43:19.30 3.0 undecidable manual Pg -0.25 0
IV.VIVA.HHZ. 2020-12-20T08:43:12.62 3.0 positive manual P 0.31 0
IV.RMP.HHZ. 2020-12-20T08:43:12.89 3.0 positive manual P -0.39 0
IV.VAGA.HHZ. 2020-12-20T08:43:08.18 0.3 undecidable manual S 145 22.4553 111 0.09 72
IV.RNI2.HNN. 2020-12-20T08:43:06.08 0.3 undecidable manual S 24 14.7741 120 0.39 68
IV.MIDA.HHZ. 2020-12-20T08:43:05.70 0.3 undecidable manual S 65 15.9729 118 -0.33 69
IV.VAGA.HHZ. 2020-12-20T08:43:04.79 0.3 undecidable manual P 145 22.4553 111 0.22 70
IV.MCI.EHN. 2020-12-20T08:43:04.80 0.3 undecidable manual P 246 24.3534 109 -0.12 71
IV.CERA.HHZ. 2020-12-20T08:43:03.27 0.1 undecidable manual S 290 5.3946 148 -0.01 100
IV.RNI2.HNN. 2020-12-20T08:43:03.21 0.3 undecidable manual P 24 14.7741 120 0.03 74
IV.MIDA.HHZ. 2020-12-20T08:43:03.20 0.3 undecidable manual P 65 15.9729 118 -0.18 71
IV.CERA.HHZ. 2020-12-20T08:43:01.74 0.1 undecidable manual P 290 5.3946 148 -0.05 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CERA.HHE. ML:0.8 0.00012163852 0.2432 AML other m 2020-12-20T08:43:06.09
IV.CERA.HHN. ML:0.9 0.00015885635500000002 0.16 AML other m 2020-12-20T08:43:03.74
IV.CERA.HNE. ML:0.8 0.00012080027 0.2624 AML other m 2020-12-20T08:43:06.09
IV.CERA.HNN. ML:1.0 0.0002016103 0.3392 AML other m 2020-12-20T08:43:03.74
IV.MIDA.HHE. ML:0.6 0.00003936164 0.2176 AML other m 2020-12-20T08:43:08.71
IV.MIDA.HHN. ML:0.7 0.0000523364 0.1024 AML other m 2020-12-20T08:43:06.92
IV.VAGA.HHE. ML:0.7 0.00003588023 0.256 AML other m 2020-12-20T08:43:10.80
IV.VAGA.HHN. ML:0.9 0.000048618745 0.2176 AML other m 2020-12-20T08:43:11.42
IV.VAGA.HNE. ML:0.7 0.00003571145 0.2368 AML other m 2020-12-20T08:43:10.80
IV.VAGA.HNN. ML:0.9 0.0000544802 0.3392 AML other m 2020-12-20T08:43:10.60
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