Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 20-09-2021 and time 22:46:11 (Italy) in region 4 km NE Opi (AQ)

A magnitude ML 1.5 earthquake occured in region: 4 km NE Opi (AQ), on

  • 20-09-2021 20:46:11 (UTC)
  • 20-09-2021 22:46:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.8140, 13.8590 at 16 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
Pescasseroli AQ 6 2203 2623
Villetta Barrea AQ 7 653 3276
Civitella Alfedena AQ 9 296 3572
Scanno AQ 10 1847 5419
San Donato Val di Comino FR 12 2107 7526
Barrea AQ 13 726 8252
Villalago AQ 14 568 8820
Bisegna AQ 15 223 9043
Settefrati FR 16 728 9771
Scontrone AQ 17 574 10345
Rocca Pia AQ 17 178 10523
Alvito FR 17 2713 13236
Campoli Appennino FR 17 1725 14961
Alfedena AQ 17 864 15825
Gallinaro FR 18 1269 17094
Pescosolido FR 18 1555 18649
Rivisondoli AQ 18 700 19349
Picinisco FR 19 1218 20567
Roccaraso AQ 19 1627 22194
Posta Fibreno FR 19 1139 23333
Pescocostanzo AQ 19 1128 24461
Lecce nei Marsi AQ 20 1702 26163
Vicalvi FR 20 783 26946
Pettorano sul Gizio AQ 20 1376 28322

Municipalities with at least 50000 inhabitants

An earthquake occurred to
65 Km SW of Chieti (51815 inhabitants)
71 Km SE of L'Aquila (69753 inhabitants)
78 Km SW of Pescara (121014 inhabitants)
82 Km SW of Montesilvano (53738 inhabitants)
88 Km E of Latina (125985 inhabitants)
89 Km E of Tivoli (56533 inhabitants)
91 Km E of Velletri (53303 inhabitants)
91 Km NW of Caserta (76326 inhabitants)
95 Km S of Teramo (54892 inhabitants)
96 Km E of Guidonia Montecelio (88673 inhabitants)
98 Km NW of Aversa (53047 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 1.5 2021-09-20
20:46:11		 41.8137 13.8588 16 2022-03-30
13:04:30		 Bollettino Sismico Italiano INGV 99747711
Reviewed
Rev100 		ML 1.5 2021-09-20
20:46:11		 41.8113 13.8567 16 2021-09-20
21:15:10		 Sala Sismica INGV-Roma 95676871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-20 20:46:11 ± 0.05
Latitude 41.8137 ± 0.0027
Longitude 13.8588 ± 0.0036
Depth (km) 16 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99747711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 300
Semi-minor axis of confidence ellipse (meter) 52
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 59
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 48
Number of associated phases, regardless of their use for origin computation 47
Number of defining phases 47
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) 0.04317
Epicentral distance of station farthest from the epicenter (degree) 0.68079
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 25
Type of magnitude ML
Reference to an origin 99747711
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-13 15:40:35

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 95676871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-20 21:15:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RCAV.EHZ. 2021-09-20T20:46:35.01 0.3 undecidable manual S 273 75.5688 94 0.34 64
IV.GIGS.HHE. 2021-09-20T20:46:34.75 0.3 undecidable manual S 342 74.7696 94 0.32 64
IV.CERT.HHE. 2021-09-20T20:46:33.77 0.6 undecidable manual S 282 73.9704 94 -0.46 40
IV.FAGN.HHZ. 2021-09-20T20:46:29.96 0.3 undecidable manual S 336 55.0005 96 0.77 58
IV.VAGA.HNZ. 2021-09-20T20:46:29.84 0.3 undecidable manual S 145 54.0015 96 0.91 51
IV.T0110.HHZ. 2021-09-20T20:46:27.35 0.3 undecidable manual S 352 46.62 97 0.39 67
IV.GUAR.HNZ. 2021-09-20T20:46:26.29 0.6 undecidable manual S 267 45.2214 98 -0.31 44
IV.TST02.HHE. 2021-09-20T20:46:26.27 0.3 undecidable manual S 68 45.9207 98 -0.49 65
IV.PTQR.HHE. 2021-09-20T20:46:26.34 0.3 undecidable manual S 302 44.3223 98 -0.01 70
IV.RCAV.EHZ. 2021-09-20T20:46:25.04 0.6 undecidable manual P 273 75.5688 94 -0.04 45
IV.MCI.EHZ. 2021-09-20T20:46:24.62 0.3 undecidable manual S 186 36.0417 101 0.46 65
IV.LPEL.HHZ. 2021-09-20T20:46:24.24 0.3 undecidable manual S 46 37.2294 100 -0.24 69
IV.MIDA.HHZ. 2021-09-20T20:46:24.40 0.3 undecidable manual S 120 37.8288 100 -0.25 70
IV.CERT.HHE. 2021-09-20T20:46:24.68 0.6 undecidable manual P 282 73.9704 94 -0.15 44
IV.GIGS.HHE. 2021-09-20T20:46:24.95 1.0 undecidable manual P 342 74.7696 94 0.01 22
IV.SGG.HHE. 2021-09-20T20:46:23.68 0.1 undecidable manual P 137 64.0914 95 0.37 63
IV.BSSO.HNN. 2021-09-20T20:46:23.58 1.0 undecidable manual P 116 67.7766 95 -0.29 22
IT.SULC.HNE. 2021-09-20T20:46:22.41 0.3 undecidable manual S 8 28.5492 105 0.19 72
IV.LRP.EHZ. 2021-09-20T20:46:22.36 0.3 undecidable manual S 231 29.1486 105 -0.02 73
IV.FAGN.HHZ. 2021-09-20T20:46:22.06 0.3 undecidable manual P 336 55.0005 96 0.14 69
IV.GIUL.HHZ. 2021-09-20T20:46:22.16 0.3 undecidable manual P 241 57.498 96 -0.14 68
IT.SULA.HNE. 2021-09-20T20:46:22.74 0.3 undecidable manual S 9 29.2485 105 0.35 69
IT.SULP.HGZ. 2021-09-20T20:46:22.84 0.3 undecidable manual S 11 30.6471 104 0.08 73
IV.VAGA.HNZ. 2021-09-20T20:46:21.81 0.3 undecidable manual P 145 54.0015 96 0.04 69
IV.CERA.HHZ. 2021-09-20T20:46:21.71 0.3 undecidable manual S 151 27.3504 106 -0.2 72
IV.RNI2.HHZ. 2021-09-20T20:46:21.99 0.3 undecidable manual S 117 27.2505 106 0.12 71
IV.VVLD.HHZ. 2021-09-20T20:46:20.14 0.3 undecidable manual S 288 20.4684 115 -0.04 73
IV.INTR.HHZ. 2021-09-20T20:46:20.54 0.3 undecidable manual S 10 22.2555 112 -0.09 72
IV.GUAR.HNZ. 2021-09-20T20:46:20.17 0.6 undecidable manual P 267 45.2214 98 -0.25 45
IV.TST02.HHE. 2021-09-20T20:46:20.40 0.1 undecidable manual P 68 45.9207 98 -0.12 94
IV.T0110.HHZ. 2021-09-20T20:46:20.58 0.1 undecidable manual P 352 46.62 97 -0.05 94
IV.PTQR.HHE. 2021-09-20T20:46:19.91 0.6 undecidable manual P 302 44.3223 98 -0.38 44
IV.POFI.HHZ. 2021-09-20T20:46:19.11 0.3 undecidable manual S 229 16.1727 123 -0.07 74
IV.MIDA.HHZ. 2021-09-20T20:46:19.08 0.1 undecidable manual P 120 37.8288 100 -0.22 94
IT.SULP.HGZ. 2021-09-20T20:46:18.16 0.3 undecidable manual P 11 30.6471 104 -0.05 72
IV.MCI.EHZ. 2021-09-20T20:46:18.75 0.6 undecidable manual P 186 36.0417 101 -0.26 46
IV.LPEL.HHZ. 2021-09-20T20:46:18.93 0.1 undecidable manual P 46 37.2294 100 -0.27 92
IV.RNI2.HHZ. 2021-09-20T20:46:18.16 0.3 undecidable manual P 117 27.2505 106 0.46 66
IT.SULA.HNE. 2021-09-20T20:46:17.72 0.3 undecidable manual P 9 29.2485 105 -0.28 69
IT.SULC.HNE. 2021-09-20T20:46:17.76 1.0 undecidable manual P 8 28.5492 105 -0.13 24
IT.OPI.HGN. 2021-09-20T20:46:17.15 0.3 undecidable manual S 210 4.7952 159 -0.09 75
IV.LRP.EHZ. 2021-09-20T20:46:17.75 0.3 undecidable manual P 231 29.1486 105 -0.23 70
IV.CERA.HHZ. 2021-09-20T20:46:17.57 0.1 undecidable manual P 151 27.3504 106 -0.15 97
IV.POFI.HHZ. 2021-09-20T20:46:16.23 0.1 positive manual P 229 16.1727 123 0.09 99
IV.VVLD.HHZ. 2021-09-20T20:46:16.79 0.1 positive manual P 288 20.4684 115 0.07 99
IV.INTR.HHZ. 2021-09-20T20:46:16.94 0.1 negative manual P 10 22.2555 112 -0.04 98
IT.OPI.HGN. 2021-09-20T20:46:15.14 0.1 positive manual P 210 4.7952 159 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.POFI.HHN. ML:1.4 0.0001965 0.14 AML other m 2021-09-20T20:46:19.51
IV.POFI.HHE. ML:1.2 0.000127408895 0.2432 AML other m 2021-09-20T20:46:20.02
IV.VVLD.HHN. ML:1.5 0.0002125107 0.1408 AML other m 2021-09-20T20:46:21.95
IV.VVLD.HHE. ML:1.6 0.000221 1.86 AML other m 2021-09-20T20:46:21.95
IV.INTR.HHE. ML:1.7 0.00029761690000000004 0.256 AML other m 2021-09-20T20:46:21.15
IV.INTR.HHN. ML:1.7 0.0002834096 0.1024 AML other m 2021-09-20T20:46:21.79
IV.CERA.HHN. ML:1.4 0.000122 0.32 AML other m 2021-09-20T20:46:22.77
IV.CERA.HHE. ML:1.0 0.000051856545000000004 0.2816 AML other m 2021-09-20T20:46:23.66
IV.RNI2.HHE. ML:1.2 0.000079456265 0.1792 AML other m 2021-09-20T20:46:23.69
IV.RNI2.HHN. ML:1.6 0.000179 0.36 AML other m 2021-09-20T20:46:25.50
IV.MIDA.HHE. ML:1.4 0.00007751021499999999 0.1792 AML other m 2021-09-20T20:46:25.40
IV.MIDA.HHN. ML:1.3 0.000072147055 0.1152 AML other m 2021-09-20T20:46:26.20
IV.T0110.HHE. ML:1.8 0.00016797823 0.32 AML other m 2021-09-20T20:46:28.10
IV.T0110.HHN. ML:1.8 0.00017221765 0.2176 AML other m 2021-09-20T20:46:28.52
IV.FAGN.HHN. ML:0.0 0.00008362364 0.2304 AML other m 2021-09-20T20:46:33.75
IV.FAGN.HHE. ML:0.0 0.000048644615 0.192 AML other m 2021-09-20T20:46:33.16
IV.POFI.HNE. ML:1.3 0.00014803842 0.2304 AML other m 2021-09-20T20:46:20.03
IV.POFI.HNN. ML:1.5 0.00022628334999999999 0.1536 AML other m 2021-09-20T20:46:19.59
IV.VVLD.HNN. ML:1.5 0.0001830505 0.256 AML other m 2021-09-20T20:46:21.96
IV.VVLD.HNE. ML:1.5 0.0001994037 0.1152 AML other m 2021-09-20T20:46:20.96
IV.INTR.HNN. ML:1.6 0.0002489514 0.128 AML other m 2021-09-20T20:46:22.00
IV.INTR.HNE. ML:1.7 0.00026938505000000004 0.2048 AML other m 2021-09-20T20:46:21.25
IV.CERA.HNE. ML:1.3 0.00009367555 0.2688 AML other m 2021-09-20T20:46:22.96
IV.CERA.HNN. ML:1.4 0.000126597535 0.32 AML other m 2021-09-20T20:46:22.77
IV.MIDA.HNE. ML:1.3 0.00006446662 0.2816 AML other m 2021-09-20T20:46:27.55
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