Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 30-09-2020 and time 22:41:13 (Italy) in region 4 km SW Opi (AQ)

A magnitude ML 1.7 earthquake occured in region: 4 km SW Opi (AQ), on

  • 30-09-2020 20:41:13 (UTC)
  • 30-09-2020 22:41:13 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7530, 13.7930 at 14 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
Opi AQ 4 420 420
San Donato Val di Comino FR 5 2107 2527
Pescasseroli AQ 6 2203 4730
Alvito FR 8 2713 7443
Campoli Appennino FR 10 1725 9168
Posta Fibreno FR 10 1139 10307
Settefrati FR 10 728 11035
Gallinaro FR 11 1269 12304
Vicalvi FR 11 783 13087
Pescosolido FR 11 1555 14642
Villetta Barrea AQ 12 653 15295
Civitella Alfedena AQ 12 296 15591
Picinisco FR 13 1218 16809
Fontechiari FR 13 1303 18112
Broccostella FR 14 2741 20853
Atina FR 15 4316 25169
Casalvieri FR 15 2698 27867
Sora FR 15 26144 54011
Casalattico FR 16 574 54585
Villa Latina FR 16 1241 55826
Barrea AQ 17 726 56552
Scanno AQ 18 1847 58399
Villavallelonga AQ 19 919 59318
San Biagio Saracinisco FR 19 349 59667
Arpino FR 19 7262 66929
Bisegna AQ 19 223 67152
Belmonte Castello FR 19 739 67891
Balsorano AQ 20 3569 71460
Isola del Liri FR 20 11715 83175

Municipalities with at least 50000 inhabitants

An earthquake occurred to
74 Km SW of Chieti (51815 inhabitants)
74 Km SE of L'Aquila (69753 inhabitants)
80 Km E of Latina (125985 inhabitants)
85 Km E of Velletri (53303 inhabitants)
86 Km E of Tivoli (56533 inhabitants)
87 Km SW of Pescara (121014 inhabitants)
88 Km NW of Caserta (76326 inhabitants)
90 Km SW of Montesilvano (53738 inhabitants)
93 Km E of Guidonia Montecelio (88673 inhabitants)
93 Km NW of Aversa (53047 inhabitants)
97 Km E of Aprilia (73446 inhabitants)
98 Km NW of Giugliano in Campania (122974 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 2020-09-30
20:41:13		 41.7528 13.7933 14 2021-02-26
14:56:12		 Bollettino Sismico Italiano INGV 85793291
Reviewed
Rev100 		ML 1.7 2020-09-30
20:41:14		 41.7505 13.7818 13 2020-09-30
20:47:58		 Sala Sismica INGV-Roma 83395591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-30 20:41:13 ± 0.06
Latitude 41.7528 ± 0.0036
Longitude 13.7933 ± 0.0048
Depth (km) 14 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 85793291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 400
Semi-minor axis of confidence ellipse (meter) 111
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 55
Circular confidence region, given by single value of horizontal uncertainty (meter) 400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 50
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.71946
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 30
Type of magnitude ML
Reference to an origin 85793291
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-12-28 13:20:20

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 83395591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-30 20:47:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PZUN.HHZ. 2020-09-30T20:42:15.49 3.0 undecidable manual Sg 5.09 0
IV.MTMR.EHZ. 2020-09-30T20:41:55.87 3.0 undecidable manual S 1.65 0
IV.CMPR.HHZ. 2020-09-30T20:41:48.46 3.0 positive manual Pg 4.98 0
IV.GIUL.HHZ. 2020-09-30T20:41:30.11 0.6 undecidable manual S 244 49.617 94 0.41 43
IV.PTQR.HHZ. 2020-09-30T20:41:28.38 0.6 undecidable manual S 313 44.0226 95 0.15 46
IV.LPEL.HHZ. 2020-09-30T20:41:28.69 0.6 undecidable manual S 45 45.8208 95 -0.01 47
IV.FIAM.HNN. 2020-09-30T20:41:28.85 0.6 undecidable manual P 316 79.8645 92 1.15 30
IV.GUAR.HNN. 2020-09-30T20:41:27.60 0.6 undecidable manual S 277 40.0266 96 0.44 44
IV.MIDA.HHZ. 2020-09-30T20:41:27.36 0.6 undecidable manual S 108 40.1265 96 0.19 47
IT.SULA.HNN. 2020-09-30T20:41:26.66 0.6 undecidable manual S 16 36.9297 97 0.31 45
IV.VCEL.EHZ. 2020-09-30T20:41:26.43 0.3 undecidable manual P 3 71.2731 93 0.04 68
IV.LIK.EHN.01 2020-09-30T20:41:26.01 0.6 undecidable manual S 215 34.1436 97 0.41 45
IV.SGG.HHN. 2020-09-30T20:41:25.15 0.3 undecidable manual P 130 63.3921 93 -0.02 68
IV.INTR.HHE. 2020-09-30T20:41:24.27 0.6 undecidable manual S 18 30.1476 99 -0.26 46
IV.FAGN.HHZ. 2020-09-30T20:41:24.80 0.3 undecidable manual P 343 59.496 93 0.23 67
IV.VAGA.HHZ. 2020-09-30T20:41:23.56 0.3 undecidable manual P 136 52.3032 94 0.09 70
IV.CERA.HHZ. 2020-09-30T20:41:23.31 0.3 undecidable manual S 133 25.3524 102 0.03 74
IV.LRP.EHZ. 2020-09-30T20:41:22.08 0.3 undecidable manual S 236 20.7681 107 -0.02 75
IV.GIUL.HHZ. 2020-09-30T20:41:22.77 0.1 undecidable manual P 244 49.617 94 -0.28 89
IV.LPEL.HHZ. 2020-09-30T20:41:22.35 0.3 undecidable manual P 45 45.8208 95 -0.12 69
IV.MIDA.HHZ. 2020-09-30T20:41:21.45 0.1 undecidable manual P 108 40.1265 96 -0.14 93
IV.PTQR.HHZ. 2020-09-30T20:41:21.96 0.1 undecidable manual P 313 44.0226 95 -0.25 91
IT.SULA.HNN. 2020-09-30T20:41:21.22 0.3 undecidable manual P 16 36.9297 97 0.1 71
IV.VVLD.HHZ. 2020-09-30T20:41:21.40 0.3 undecidable manual S 313 19.0698 110 -0.28 71
IV.GUAR.HNN. 2020-09-30T20:41:21.35 0.1 undecidable manual P 277 40.0266 96 -0.24 92
IV.LIK.EHN.01 2020-09-30T20:41:20.59 0.3 undecidable manual P 215 34.1436 97 -0.09 71
IV.RNI2.HHZ. 2020-09-30T20:41:20.60 0.1 positive manual P 100 30.2475 99 0.51 88
IV.POFI.HHZ. 2020-09-30T20:41:19.28 0.3 undecidable manual S 240 7.7811 143 0.06 74
IV.CERA.HHZ. 2020-09-30T20:41:19.20 0.1 positive manual P 133 25.3524 102 -0.15 95
IV.MCI.EHZ. 2020-09-30T20:41:19.71 0.1 undecidable manual P 177 29.0487 100 -0.2 93
IV.INTR.HHE. 2020-09-30T20:41:19.92 0.1 undecidable manual P 18 30.1476 99 -0.15 95
IV.VVLD.HHZ. 2020-09-30T20:41:18.34 0.1 positive manual P 313 19.0698 110 -0.08 98
IT.OPI.HGE. 2020-09-30T20:41:18.45 0.6 undecidable manual S 50 3.996 160 -0.29 49
IV.LRP.EHZ. 2020-09-30T20:41:18.60 0.1 undecidable manual P 236 20.7681 107 -0.06 98
IV.POFI.HHZ. 2020-09-30T20:41:17.06 0.1 positive manual P 240 7.7811 143 0.06 100
IT.OPI.HGE. 2020-09-30T20:41:16.82 0.1 undecidable manual P 50 3.996 160 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.POFI.HHN. ML:1.9 0.0008155000000000001 0.64 AML other m 2020-09-30T20:41:19.81
IV.POFI.HNN. ML:1.9 0.0009019999999999999 0.3 AML other m 2020-09-30T20:41:19.81
IV.POFI.HNE. ML:1.8 0.0006675 1.58 AML other m 2020-09-30T20:41:20.16
IV.POFI.HHE. ML:1.7 0.0005755 1.56 AML other m 2020-09-30T20:41:20.94
IV.VVLD.HHN. ML:1.7 0.0003435 0.34 AML other m 2020-09-30T20:41:21.50
IV.VVLD.HHE. ML:1.7 0.000315 0.22 AML other m 2020-09-30T20:41:23.38
IV.CERA.HHE. ML:1.8 0.0003305 0.26 AML other m 2020-09-30T20:41:24.34
IV.CERA.HNE. ML:1.8 0.000307 0.24 AML other m 2020-09-30T20:41:24.34
IV.CERA.HNN. ML:1.8 0.000382 0.34 AML other m 2020-09-30T20:41:24.67
IV.CERA.HHN. ML:1.8 0.00038549999999999994 0.36 AML other m 2020-09-30T20:41:24.66
IV.RNI2.HHN. ML:2.0 0.0004325 0.14 AML other m 2020-09-30T20:41:26.55
IV.RNI2.HNN. ML:2.0 0.00041000000000000005 0.12 AML other m 2020-09-30T20:41:26.55
IV.MCI.EHE. ML:2.0 0.0004285 1.3 AML other m 2020-09-30T20:41:27.78
IV.RNI2.HHE. ML:2.0 0.0005315000000000001 0.62 AML other m 2020-09-30T20:41:27.17
IV.RNI2.HNE. ML:2.0 0.0005005 0.62 AML other m 2020-09-30T20:41:27.17
IV.MCI.EHN. ML:1.7 0.0002145 0.74 AML other m 2020-09-30T20:41:27.36
IV.MIDA.HHN. ML:1.6 0.000132 0.28 AML other m 2020-09-30T20:41:28.57
IV.MIDA.HHE. ML:1.5 0.00009765 0.18 AML other m 2020-09-30T20:41:29.16
IV.LPEL.HHE. ML:1.8 0.00016900000000000002 0.44 AML other m 2020-09-30T20:41:29.20
IV.LPEL.HHN. ML:1.7 0.00014900000000000002 0.14 AML other m 2020-09-30T20:41:30.70
IV.GIUL.HHN. ML:1.4 0.00007159999999999999 1.14 AML other m 2020-09-30T20:41:30.80
IV.GIUL.HHE. ML:1.3 0.00005305 1.32 AML other m 2020-09-30T20:41:30.97
IV.PTQR.HHN. ML:1.1 0.000035799999999999996 0.54 AML other m 2020-09-30T20:41:31.30
IV.PTQR.HHE. ML:1.3 0.000056149999999999996 0.2 AML other m 2020-09-30T20:41:31.14
IV.VAGA.HHN. ML:1.4 0.00006645 0.2 AML other m 2020-09-30T20:41:33.16
IV.VCEL.EHN. ML:1.6 0.00006654999999999999 1.02 AML other m 2020-09-30T20:41:37.88
IV.VAGA.HHE. ML:1.2 0.00003835 0.42 AML other m 2020-09-30T20:41:37.96
IV.VCEL.EHE. ML:1.7 0.0000738 0.28 AML other m 2020-09-30T20:41:38.35
IV.FAGN.HHE. ML:1.9 0.0001725 0.5 AML other m 2020-09-30T20:41:41.05
IV.FAGN.HHN. ML:1.8 0.00011300000000000001 0.46 AML other m 2020-09-30T20:41:41.66
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