Earthquake with magnitude of ML 1.7 on date 23-09-2021 and time 20:10:31 (Italy) 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) 41.504, 14.178 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.

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 5 1541 3805
Fontegreca CE 5 811 4616
Gallo Matese CE 6 579 5195
Sant'Agapito IS 6 1496 6691
Longano IS 6 690 7381
Ciorlano CE 6 426 7807
Macchia d'Isernia IS 7 1035 8842
Prata Sannita CE 8 1502 10344
Letino CE 8 712 11056
Montaquila IS 9 2456 13512
Pozzilli IS 10 2380 15892
Castelpizzuto IS 10 155 16047
Isernia IS 10 21842 37889
Pratella CE 11 1565 39454
Valle Agricola CE 11 890 40344
Filignano IS 11 648 40992
Venafro IS 11 11280 52272
Pettoranello del Molise IS 11 460 52732
Fornelli IS 12 1909 54641
Colli a Volturno IS 12 1349 55990
Sesto Campano IS 12 2388 58378
Ailano CE 13 1369 59747
Conca Casale IS 14 200 59947
Roccamandolfi IS 14 938 60885
Pesche IS 15 1661 62546
Castelpetroso IS 15 1680 64226
Rocchetta a Volturno IS 15 1113 65339
Raviscanina CE 16 1319 66658
Carpinone IS 16 1157 67815
Scapoli IS 16 680 68495
Presenzano CE 16 1766 70261
Miranda IS 17 1047 71308
Santa Maria del Molise IS 17 665 71973
Sant'Angelo d'Alife CE 17 2270 74243
Viticuso FR 18 353 74596
Cerro al Volturno IS 18 1281 75877
Cantalupo nel Sannio IS 18 739 76616
Acquaviva d'Isernia IS 19 425 77041
Mignano Monte Lungo CE 19 3250 80291
Acquafondata FR 19 263 80554
Vairano Patenora CE 19 6594 87148
San Massimo CB 19 855 88003
Castel San Vincenzo IS 19 516 88519
San Pietro Infine CE 19 944 89463
Sessano del Molise IS 20 727 90190

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)
65 Km NW of Benevento (60091 inhabitants)
66 Km N of Afragola (65057 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)
79 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)
94 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
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
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 ± 0.09
Latitude 41.5043 ± 0.0054
Longitude 14.1780 ± 0.0084
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 95793831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 751
Semi-minor axis of confidence ellipse (meter) 212
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 228
Circular confidence region, given by single value of horizontal uncertainty (meter) 750
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 112
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 22
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) 0.09803
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
Magnitude information

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 Takeoff_angle Residual Weight
IV.INTR.HHZ. 2021-09-23T18:10:50.43 0.3 undecidable manual S 338 0.5459 50 0.04 70
IT.SULP.HGZ. 2021-09-23T18:10:50.54 3.0 undecidable manual S 342 0.6097 50 -1.72 0
IT.OPI.HGE. 2021-09-23T18:10:45.73 0.6 undecidable manual S 316 0.3759 50 0.39 45
IV.BSSO.HHZ. 2021-09-23T18:10:44.01 0.3 undecidable manual S 82 0.3139 50 0.51 67
IV.PTRJ.HNE. 2021-09-23T18:10:43.49 0.6 undecidable manual S 118 0.2977 50 0.46 45
IV.TST01.HHZ. 2021-09-23T18:10:43.33 0.3 undecidable manual S 33 0.2896 50 0.54 66
IT.SULP.HGZ. 2021-09-23T18:10:42.93 0.1 undecidable manual P 342 0.6097 50 -0.47 85
IV.INTR.HHZ. 2021-09-23T18:10:41.70 0.3 positive manual P 338 0.5459 50 -0.62 61
IT.OPI.HGE. 2021-09-23T18:10:39.25 0.1 undecidable manual P 316 0.3759 50 -0.15 95
IV.SGG.HHZ. 2021-09-23T18:10:39.83 0.6 undecidable manual S 128 0.1916 113 0.52 45
IV.RNI2.HNE. 2021-09-23T18:10:39.88 0.3 undecidable manual S 355 0.1996 112 0.27 72
IV.CERA.HHZ. 2021-09-23T18:10:38.33 0.3 undecidable manual S 308 0.152 118 0.4 71
IV.BSSO.HHZ. 2021-09-23T18:10:38.19 1.0 positive manual P 82 0.3139 50 -0.15 24
IV.MIDA.HHZ. 2021-09-23T18:10:37.73 0.6 undecidable manual S 22 0.1484 119 -0.1 50
IV.TST01.HHZ. 2021-09-23T18:10:37.69 0.1 undecidable manual P 33 0.2896 50 -0.24 95
IV.PTRJ.HNE. 2021-09-23T18:10:37.83 0.1 undecidable manual P 118 0.2977 50 -0.24 95
IV.MCI.EHE. 2021-09-23T18:10:37.86 0.1 undecidable manual P 267 0.2734 107 0.21 96
IV.VAGA.HHZ. 2021-09-23T18:10:36.44 0.6 undecidable manual S 155 0.098 130 0.22 50
IV.SGG.HHZ. 2021-09-23T18:10:35.60 0.1 negative manual P 128 0.1916 113 -0.32 95
IV.RNI2.HNE. 2021-09-23T18:10:35.96 0.1 undecidable manual P 355 0.1996 112 -0.14 99
IV.CERA.HHZ. 2021-09-23T18:10:35.47 0.3 positive manual P 308 0.152 118 0.34 72
IV.MIDA.HHZ. 2021-09-23T18:10:34.72 0.1 positive manual P 22 0.1484 119 -0.35 95
IV.VAGA.HHZ. 2021-09-23T18:10:33.97 0.1 positive manual P 155 0.098 130 -0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VAGA.HNE. ML:2.1 0.001695 1.02 AML other m 2021-09-23T18:10:36.18
IV.VAGA.HHN. ML:2.5 0.0037 1.14 AML other m 2021-09-23T18:10:36.82
IV.VAGA.HNN. ML:2.4 0.00351 1.12 AML other m 2021-09-23T18:10:36.82
IV.VAGA.HHE. ML:1.9 0.001115 0.22 AML other m 2021-09-23T18:10:38.34
IV.MIDA.HHE. ML:1.6 0.00038 0.42 AML other m 2021-09-23T18:10:39.05
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 0.00058 0.38 AML other m 2021-09-23T18:10:42.39
IV.SGG.HHE. ML:1.8 0.0005415 1.34 AML other m 2021-09-23T18:10:42.05
IV.CERA.HHN. ML:1.6 0.000398 1.02 AML other m 2021-09-23T18:10:43.03
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 8.8E-5 0.62 AML other m 2021-09-23T18:10:45.63
IV.TST01.HHN. ML:1.4 0.00010715 0.4 AML other m 2021-09-23T18:10:49.51
IV.BSSO.HHN. ML:1.5 0.0001308 0.8 AML other m 2021-09-23T18:10:49.83
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 8.065E-5 1.58 AML other m 2021-09-23T18:10:53.93
IV.INTR.HHN. ML:1.6 7.41E-5 0.28 AML other m 2021-09-23T18:10:55.36
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