Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 23-09-2020 and time 22:26:26 (Italy) in region 3 km SW Colli a Volturno (IS)

A magnitude ML 1.1 earthquake occured in region: 3 km SW Colli a Volturno (IS), on

  • 23-09-2020 20:26:26 (UTC)
  • 23-09-2020 22:26:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.5870, 14.0790 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.

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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
Scapoli IS 4 680 2029
Montaquila IS 4 2456 4485
Rocchetta a Volturno IS 4 1113 5598
Filignano IS 5 648 6246
Fornelli IS 6 1909 8155
Macchia d'Isernia IS 8 1035 9190
Castel San Vincenzo IS 8 516 9706
Cerro al Volturno IS 8 1281 10987
Pozzilli IS 8 2380 13367
Pizzone IS 10 329 13696
Monteroduni IS 11 2264 15960
Acquaviva d'Isernia IS 11 425 16385
Viticuso FR 11 353 16738
Venafro IS 11 11280 28018
Acquafondata FR 12 263 28281
Conca Casale IS 12 200 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 14 538 55828
Forlì del Sannio IS 15 675 56503
Rionero Sannitico IS 15 1118 57621
Miranda IS 15 1047 58668
Longano IS 16 690 59358
Ciorlano CE 16 426 59784
Pettoranello del Molise IS 17 460 60244
Fontegreca CE 17 811 61055
Alfedena AQ 17 864 61919
Pesche IS 17 1661 63580
Roccasicura IS 18 550 64130
San Vittore del Lazio FR 18 2636 66766
Scontrone AQ 18 574 67340
Gallo Matese CE 18 579 67919
Sesto Campano IS 18 2388 70307
Sant'Elia Fiumerapido FR 18 6166 76473
Cervaro FR 19 8109 84582
San Pietro Infine CE 19 944 85526
Picinisco FR 19 1218 86744
Castelpizzuto IS 19 155 86899
Prata Sannita CE 20 1502 88401

Municipalities with at least 50000 inhabitants

An earthquake occurred to
61 Km NW of Caserta (76326 inhabitants)
69 Km N of Aversa (53047 inhabitants)
74 Km N of Giugliano in Campania (122974 inhabitants)
75 Km NW of Acerra (59573 inhabitants)
76 Km N of Afragola (65057 inhabitants)
77 Km N of Marano di Napoli (59874 inhabitants)
78 Km NW of Benevento (60091 inhabitants)
78 Km N of Casoria (77642 inhabitants)
82 Km N of Pozzuoli (81661 inhabitants)
84 Km N of Napoli (974074 inhabitants)
85 Km S of Chieti (51815 inhabitants)
88 Km N of Portici (55274 inhabitants)
89 Km N of Ercolano (53709 inhabitants)
92 Km N of Torre del Greco (86275 inhabitants)
96 Km NW of Avellino (54857 inhabitants)
98 Km S of Pescara (121014 inhabitants)
99 Km E of Latina (125985 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 1.1 2020-09-23
20:26:26		 41.5867 14.0792 11 2021-02-26
14:56:17		 Bollettino Sismico Italiano INGV 86701281
Reviewed
Rev100 		ML 1.2 2020-09-23
20:26:26		 41.6445 14.2402 22 2020-09-23
20:38:47		 Sala Sismica INGV-Roma 83168201
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-23 20:26:26 ± 0.1
Latitude 41.5867 ± 0.0090
Longitude 14.0792 ± 0.0108
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86701281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1120
Semi-minor axis of confidence ellipse (meter) 700
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 324
Circular confidence region, given by single value of horizontal uncertainty (meter) 1120.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.44426
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 86701281
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-30 01:12:50

ML:1.2

Field Value
Value 1.2
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 83168201
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-23 20:38:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CPGN.EHZ. 2020-09-23T20:27:56.82 3.0 undecidable manual Sg 14.94 0
GU.GRAM.HHZ. 2020-09-23T20:27:39.96 3.0 undecidable manual Pg 12.98 0
GU.RNCA.HHZ. 2020-09-23T20:27:32.62 3.0 negative manual Pn -2.6 0
SL.LJU.BHZ. 2020-09-23T20:27:30.57 3.0 undecidable manual Pn 1.2 0
IV.NDIM.HNZ. 2020-09-23T20:27:29.01 3.0 positive manual Pn 3.45 0
IV.CAGR.HHZ. 2020-09-23T20:27:12.11 3.0 negative manual Pn 1.62 0
IV.INTR.HHZ. 2020-09-23T20:26:42.54 0.6 undecidable manual S 343 49.3173 90 -0.01 47
IV.VVLD.HHZ. 2020-09-23T20:26:42.08 0.6 undecidable manual S 310 49.1175 90 -0.42 43
IV.MCI.EHE. 2020-09-23T20:26:36.73 0.6 undecidable manual S 244 24.5532 90 0.79 40
IV.INTR.HHZ. 2020-09-23T20:26:35.68 0.3 undecidable manual P 343 49.3173 90 -0.27 67
IV.VAGA.HHZ. 2020-09-23T20:26:35.57 0.6 undecidable manual S 146 22.9548 90 0.05 49
IV.VVLD.HHZ. 2020-09-23T20:26:35.46 0.3 undecidable manual P 310 49.1175 90 -0.46 65
IV.CMPR.HHZ. 2020-09-23T20:26:34.43 3.0 undecidable manual P -1.33 0
IV.MIDA.HHZ. 2020-09-23T20:26:33.39 0.3 undecidable manual S 67 15.7731 90 -0.21 72
IV.SGO.HHZ. 2020-09-23T20:26:33.16 3.0 undecidable manual P -0.02 0
IV.RNI2.HHZ. 2020-09-23T20:26:33.95 0.3 undecidable manual S 25 14.2746 91 0.74 61
IV.POFI.HNE. 2020-09-23T20:26:33.51 0.3 undecidable manual P 296 33.744 90 -0.04 72
IV.MCI.EHE. 2020-09-23T20:26:32.24 0.3 undecidable manual P 244 24.5532 90 0.11 73
IV.VAGA.HHZ. 2020-09-23T20:26:32.09 0.3 undecidable manual P 146 22.9548 90 0.2 72
IV.CERA.HNN. 2020-09-23T20:26:30.85 0.6 undecidable manual S 284 5.1948 147 -0.34 48
IV.MIDA.HHZ. 2020-09-23T20:26:30.68 0.1 undecidable manual P 67 15.7731 90 -0.1 98
IV.RNI2.HHZ. 2020-09-23T20:26:30.70 0.1 undecidable manual P 25 14.2746 91 0.14 98
IV.CERA.HNN. 2020-09-23T20:26:29.29 0.1 undecidable manual P 284 5.1948 147 -0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MIDA.HHN. ML:1.0 0.00009779999999999999 0.3 AML other m 2020-09-23T20:26:34.35
IV.MIDA.HHE. ML:1.1 0.00010555 0.28 AML other m 2020-09-23T20:26:34.22
IV.RNI2.HHE. ML:1.2 0.00015099999999999998 1.06 AML other m 2020-09-23T20:26:34.37
IV.RNI2.HHN. ML:1.0 0.0000988 0.12 AML other m 2020-09-23T20:26:34.94
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