Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 23-09-2021 and time 18:10:31 (UTC) in region 2 km S Monteroduni (IS)

A magnitude ML 1.7 earthquake occured in region: 2 km S Monteroduni (IS), on

  • 23-09-2021 18:10:31 (UTC)
  • 23-09-2021 20:10:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.5030, 14.1720 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
Monteroduni IS 2 2264 2264
Capriati a Volturno CE 4 1541 3805
Fontegreca CE 5 811 4616
Ciorlano CE 6 426 5042
Gallo Matese CE 6 579 5621
Sant'Agapito IS 6 1496 7117
Longano IS 7 690 7807
Macchia d'Isernia IS 7 1035 8842
Prata Sannita CE 8 1502 10344
Montaquila IS 9 2456 12800
Letino CE 9 712 13512
Pozzilli IS 9 2380 15892
Castelpizzuto IS 10 155 16047
Isernia IS 11 21842 37889
Venafro IS 11 11280 49169
Filignano IS 11 648 49817
Pratella CE 11 1565 51382
Valle Agricola CE 11 890 52272
Fornelli IS 12 1909 54181
Sesto Campano IS 12 2388 56569
Pettoranello del Molise IS 12 460 57029
Colli a Volturno IS 12 1349 58378
Ailano CE 13 1369 59747
Conca Casale IS 14 200 59947
Roccamandolfi IS 15 938 60885
Pesche IS 15 1661 62546
Rocchetta a Volturno IS 15 1113 63659
Scapoli IS 16 680 64339
Raviscanina CE 16 1319 65658
Presenzano CE 16 1766 67424
Castelpetroso IS 16 1680 69104
Carpinone IS 16 1157 70261
Viticuso FR 17 353 70614
Miranda IS 17 1047 71661
Sant'Angelo d'Alife CE 17 2270 73931
Santa Maria del Molise IS 18 665 74596
Cerro al Volturno IS 18 1281 75877
Cantalupo nel Sannio IS 19 739 76616
Mignano Monte Lungo CE 19 3250 79866
Acquafondata FR 19 263 80129
San Pietro Infine CE 19 944 81073
Vairano Patenora CE 19 6594 87667
Acquaviva d'Isernia IS 19 425 88092
Castel San Vincenzo IS 19 516 88608
San Massimo CB 20 855 89463
Pietravairano CE 20 2984 92447

Municipalities with at least 50000 inhabitants

An earthquake occurred to
49 Km N of Caserta (76326 inhabitants)
59 Km N of Aversa (53047 inhabitants)
64 Km N of Giugliano in Campania (122974 inhabitants)
64 Km N of Acerra (59573 inhabitants)
66 Km N of Afragola (65057 inhabitants)
66 Km NW of Benevento (60091 inhabitants)
67 Km N of Casoria (77642 inhabitants)
67 Km N of Marano di Napoli (59874 inhabitants)
73 Km N of Pozzuoli (81661 inhabitants)
74 Km N of Napoli (974074 inhabitants)
77 Km N of Portici (55274 inhabitants)
78 Km N of Ercolano (53709 inhabitants)
81 Km N of Torre del Greco (86275 inhabitants)
84 Km NW of Avellino (54857 inhabitants)
89 Km NW of Scafati (50787 inhabitants)
93 Km N of Castellammare di Stabia (66466 inhabitants)
94 Km S of Chieti (51815 inhabitants)
100 Km NW of Cava de' Tirreni (53659 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 1.7 2021-09-23
18:10:31		 41.5027 14.1717 10 2022-03-30
13:04:08		 Bollettino Sismico Italiano INGV 95994641
Reviewed
Rev100 		ML 1.7 2021-09-23
18:10:31		 41.5043 14.178 9 2021-09-23
18:19:04		 Sala Sismica INGV-Roma 95793831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-23 18:10:31 ± 0.11
Latitude 41.5027 ± 0.0063
Longitude 14.1717 ± 0.0084
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95994641

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 854
Semi-minor axis of confidence ellipse (meter) 164
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 231
Circular confidence region, given by single value of horizontal uncertainty (meter) 850.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 116
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
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) 0.09893
Epicentral distance of station farthest from the epicenter (degree) 0.60974
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 95994641
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-28 14:12:02

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 95793831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-23 18:19:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.INTR.HHZ. 2021-09-23T18:10:50.40 0.6 undecidable manual S 339 60.5949 50 0.19 46
IT.OPI.HGE. 2021-09-23T18:10:44.97 0.6 undecidable manual S 317 41.5251 50 -0.13 48
IV.TST01.HHZ. 2021-09-23T18:10:43.33 0.3 undecidable manual S 33 32.6451 50 0.59 65
IV.BSSO.HHZ. 2021-09-23T18:10:43.81 0.6 undecidable manual S 82 35.4423 50 0.34 46
IV.PTRJ.HNE. 2021-09-23T18:10:43.49 0.6 undecidable manual S 117 33.4443 50 0.53 44
IT.SULP.HGZ. 2021-09-23T18:10:42.93 0.1 undecidable manual P 343 67.6767 50 -0.34 87
IV.INTR.HHZ. 2021-09-23T18:10:41.64 0.1 positive manual P 339 60.5949 50 -0.55 84
IV.SGG.HHZ. 2021-09-23T18:10:39.83 0.6 undecidable manual S 127 21.5673 114 0.42 47
IV.RNI2.HNE. 2021-09-23T18:10:39.88 0.3 undecidable manual S 356 22.2555 113 0.23 73
IT.OPI.HGE. 2021-09-23T18:10:39.12 0.6 undecidable manual P 317 41.5251 50 -0.12 48
IV.MCI.EHE. 2021-09-23T18:10:38.04 1.0 undecidable manual P 268 29.8479 50 0.6 22
IV.CERA.HHZ. 2021-09-23T18:10:38.33 0.3 undecidable manual S 310 16.5723 120 0.47 70
IV.BSSO.HHZ. 2021-09-23T18:10:38.13 0.1 positive manual P 82 35.4423 50 -0.17 96
IV.PTRJ.HNE. 2021-09-23T18:10:38.09 0.3 undecidable manual P 117 33.4443 50 0.09 74
IV.MIDA.HHZ. 2021-09-23T18:10:37.73 0.6 undecidable manual S 24 16.872 119 -0.23 49
IV.TST01.HHZ. 2021-09-23T18:10:37.69 0.1 undecidable manual P 33 32.6451 50 -0.18 96
IV.RNI2.HNE. 2021-09-23T18:10:36.27 0.3 undecidable manual P 356 22.2555 113 0.18 74
IV.VAGA.HHZ. 2021-09-23T18:10:36.44 0.6 undecidable manual S 152 10.9779 131 0.16 50
IV.SGG.HHZ. 2021-09-23T18:10:35.52 0.3 undecidable manual P 127 21.5673 114 -0.43 70
IV.CERA.HHZ. 2021-09-23T18:10:35.38 0.3 undecidable manual P 310 16.5723 120 0.32 72
IV.MIDA.HHZ. 2021-09-23T18:10:34.72 0.1 positive manual P 24 16.872 119 -0.4 94
IV.VAGA.HHZ. 2021-09-23T18:10:33.97 0.1 positive manual P 152 10.9779 131 -0.18 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VAGA.HNE. ML:2.1 0.001537779 0.1536 AML other m 2021-09-23T18:10:36.68
IV.VAGA.HNN. ML:2.4 0.0033257805 0.256 AML other m 2021-09-23T18:10:37.64
IV.VAGA.HHN. ML:2.5 0.003500807 0.256 AML other m 2021-09-23T18:10:37.64
IV.VAGA.HHE. ML:2.0 0.0011149999999999999 0.22 AML other m 2021-09-23T18:10:38.34
IV.MIDA.HHE. ML:1.6 0.0003606748 0.3968 AML other m 2021-09-23T18:10:41.40
IV.MIDA.HHN. ML:1.7 0.000435 1.8 AML other m 2021-09-23T18:10:41.97
IV.SGG.HHN. ML:1.9 0.0005800000000000001 0.38 AML other m 2021-09-23T18:10:42.39
IV.SGG.HHE. ML:1.9 0.0005220491 0.5632 AML other m 2021-09-23T18:10:41.23
IV.CERA.HHN. ML:1.6 0.0003846128 0.2432 AML other m 2021-09-23T18:10:40.65
IV.CERA.HHE. ML:1.5 0.000268 0.52 AML other m 2021-09-23T18:10:43.55
IV.TST01.HHE. ML:1.3 0.00008052713 0.3712 AML other m 2021-09-23T18:10:45.63
IV.TST01.HHN. ML:1.4 0.00010714999999999999 0.4 AML other m 2021-09-23T18:10:49.51
IV.BSSO.HHN. ML:1.5 0.00012542005 0.6016 AML other m 2021-09-23T18:10:48.79
IV.BSSO.HHE. ML:1.5 0.000136 0.7 AML other m 2021-09-23T18:10:51.36
IV.INTR.HHE. ML:1.6 0.00008065 1.58 AML other m 2021-09-23T18:10:53.93
IV.INTR.HHN. ML:1.6 0.0000741 0.28 AML other m 2021-09-23T18:10:55.36
IV.MIDA.HNE. ML:1.7 0.00040431755000000004 0.2304 AML other m 2021-09-23T18:10:40.97
IV.MIDA.HNN. ML:1.7 0.0004854286 0.5376 AML other m 2021-09-23T18:10:42.54
IV.CERA.HNN. ML:1.6 0.00036053610000000004 0.256 AML other m 2021-09-23T18:10:40.65
IV.CERA.HNE. ML:1.6 0.00035968659999999995 0.4096 AML other m 2021-09-23T18:10:42.57
IV.SGG.HNE. ML:1.8 0.000422647 0.5248 AML other m 2021-09-23T18:10:40.35
IV.SGG.HNN. ML:1.9 0.00060704965 0.3712 AML other m 2021-09-23T18:10:42.39
IV.BSSO.HNN. ML:1.5 0.0001262556 0.6016 AML other m 2021-09-23T18:10:48.49
IV.BSSO.HNE. ML:1.5 0.00013179767000000002 0.704 AML other m 2021-09-23T18:10:51.01
IV.INTR.HNN. ML:1.8 0.00014278865 0.6272 AML other m 2021-09-23T18:11:03.20
IV.INTR.HNE. ML:2.0 0.00021475885 0.8704 AML other m 2021-09-23T18:10:59.37
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