Earthquake with magnitude of ML 1.7 on date 20-09-2021 and time 22:58:35 (Italy) in region 4 km NE Opi (AQ)

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

  • 20-09-2021 20:58:35 (UTC)
  • 20-09-2021 22:58:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.812, 13.859 at 16 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
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
Alvito FR 17 2713 12484
Scontrone AQ 17 574 13058
Rocca Pia AQ 17 178 13236
Campoli Appennino FR 17 1725 14961
Alfedena AQ 17 864 15825
Gallinaro FR 18 1269 17094
Pescosolido FR 18 1555 18649
Picinisco FR 18 1218 19867
Rivisondoli AQ 19 700 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
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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.7 2021-09-20
20:58:35
41.8122 13.859 16 2021-09-20
21:42:04
Sala Sismica INGV-Roma 95677521
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-20 20:58:35 ± 0.04
Latitude 41.8122 ± 0.0018
Longitude 13.8590 ± 0.0024
Depth (km) 16 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95677521

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 190
Semi-minor axis of confidence ellipse (meter) 26
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 232
Circular confidence region, given by single value of horizontal uncertainty (meter) 190
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 35
Number of associated phases, regardless of their use for origin computation 56
Number of defining phases 56
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.04137
Epicentral distance of station farthest from the epicenter (degree) 0.74104
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 29
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 95677521
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-20 21:42:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FIAM.HHZ. 2021-09-20T20:58:59.12 1.0 undecidable manual S 310 0.715 95 0.3 21
IV.RCAV.EHE. 2021-09-20T20:58:57.95 0.6 undecidable manual S 273 0.6817 95 0.12 44
IV.GIGS.HHN. 2021-09-20T20:58:57.97 0.3 undecidable manual S 342 0.6745 95 0.33 64
IV.CERT.HNN. 2021-09-20T20:58:57.78 0.6 undecidable manual S 282 0.6673 95 0.38 42
MN.AQU.HNN. 2021-09-20T20:58:56.60 1.0 undecidable manual S 328 0.6376 95 0.06 23
IV.SGG.HNN. 2021-09-20T20:58:55.14 0.6 undecidable manual S 137 0.5765 96 0.42 43
IV.GIUL.HHN. 2021-09-20T20:58:53.16 0.6 undecidable manual S 241 0.5171 97 0.16 46
IV.VAGA.HHZ. 2021-09-20T20:58:52.19 0.6 undecidable manual S 145 0.4856 97 0.13 46
IV.FAGN.HHZ. 2021-09-20T20:58:52.76 0.3 undecidable manual S 336 0.4973 97 0.35 66
IV.TST02.HHZ. 2021-09-20T20:58:50.00 0.3 undecidable manual S 67 0.4137 99 0.05 71
IV.T0110.HHZ. 2021-09-20T20:58:50.28 0.3 undecidable manual S 352 0.4218 99 0.1 71
IV.PTQR.HHZ. 2021-09-20T20:58:49.68 0.3 undecidable manual S 302 0.4002 100 0.12 71
IV.TST01.HHZ. 2021-09-20T20:58:49.61 1.0 undecidable manual S 99 0.3984 100 0.1 24
IV.LATB.EHN. 2021-09-20T20:58:49.35 0.6 undecidable manual P 245 0.741 94 0.1 44
IV.GUAR.HHE. 2021-09-20T20:58:49.60 0.3 undecidable manual S 268 0.4074 99 -0.17 70
IV.RCAV.EHE. 2021-09-20T20:58:48.08 0.3 undecidable manual P 273 0.6817 95 -0.16 66
IV.FIAM.HHZ. 2021-09-20T20:58:48.78 0.1 undecidable manual P 310 0.715 95 -0.02 90
IV.GIGS.HHN. 2021-09-20T20:58:47.87 0.1 undecidable manual P 342 0.6745 95 -0.26 86
IV.CERT.HNN. 2021-09-20T20:58:47.71 0.1 undecidable manual P 282 0.6673 95 -0.28 86
IV.LPEL.HHZ. 2021-09-20T20:58:47.51 0.3 undecidable manual S 46 0.3363 102 -0.19 71
IV.BSSO.HHE. 2021-09-20T20:58:47.00 0.6 undecidable manual P 116 0.6097 96 -0.01 46
IV.MIDA.HHZ. 2021-09-20T20:58:47.84 0.3 undecidable manual S 120 0.3399 102 0.03 73
MN.AQU.HNN. 2021-09-20T20:58:47.54 0.1 undecidable manual P 328 0.6376 95 0.05 91
IV.MCI.EHE. 2021-09-20T20:58:47.50 1.0 undecidable manual S 186 0.3229 103 0.2 24
IV.SGG.HNN. 2021-09-20T20:58:46.24 0.1 undecidable manual P 137 0.5765 96 -0.2 89
IT.SULP.HGE. 2021-09-20T20:58:46.03 0.3 undecidable manual S 11 0.277 106 0.03 74
IV.LRP.EHZ. 2021-09-20T20:58:45.82 0.3 undecidable manual S 231 0.2617 107 0.26 70
IT.SULA.HNN. 2021-09-20T20:58:45.77 0.3 undecidable manual S 9 0.2644 107 0.13 72
IV.RNI2.HHZ. 2021-09-20T20:58:45.13 0.3 undecidable manual S 116 0.2446 109 0.07 73
IV.GIUL.HHN. 2021-09-20T20:58:45.36 0.1 positive manual P 241 0.5171 97 -0.09 92
IT.SULC.HNZ. 2021-09-20T20:58:45.48 0.3 undecidable manual S 8 0.2581 108 0.01 74
IV.CERA.HHZ. 2021-09-20T20:58:45.16 0.3 undecidable manual S 151 0.2446 109 0.07 73
IV.FAGN.HHZ. 2021-09-20T20:58:44.75 0.1 undecidable manual P 336 0.4973 97 -0.35 88
IV.VAGA.HHZ. 2021-09-20T20:58:44.97 0.1 undecidable manual P 145 0.4856 97 0.07 94
IV.VVLD.HHZ. 2021-09-20T20:58:43.23 0.3 undecidable manual S 288 0.1844 117 -0.22 72
IV.GUAR.HHE. 2021-09-20T20:58:43.50 0.1 undecidable manual P 268 0.4074 99 -0.08 94
IV.PTQR.HHZ. 2021-09-20T20:58:43.34 0.1 positive manual P 302 0.4002 100 -0.12 94
IV.INTR.HHZ. 2021-09-20T20:58:43.75 0.3 undecidable manual S 10 0.2023 115 -0.16 73
IV.TST01.HHZ. 2021-09-20T20:58:43.23 1.0 undecidable manual P 99 0.3984 100 -0.2 23
IV.TST02.HHZ. 2021-09-20T20:58:43.68 0.1 positive manual P 67 0.4137 99 -0.01 96
IV.T0110.HHZ. 2021-09-20T20:58:43.75 0.1 positive manual P 352 0.4218 99 -0.07 95
IV.POFI.HHZ. 2021-09-20T20:58:42.06 0.3 undecidable manual S 229 0.1448 126 -0.37 71
IV.MIDA.HHZ. 2021-09-20T20:58:42.34 0.1 positive manual P 120 0.3399 102 -0.1 96
IV.LPEL.HHZ. 2021-09-20T20:58:42.17 0.1 positive manual P 46 0.3363 102 -0.21 93
IT.SULP.HGE. 2021-09-20T20:58:41.52 0.1 undecidable manual P 11 0.277 106 0.12 96
IV.MCI.EHE. 2021-09-20T20:58:41.98 0.3 undecidable manual P 186 0.3229 103 -0.18 71
IV.LRP.EHZ. 2021-09-20T20:58:41.28 0.1 positive manual P 231 0.2617 107 0.13 96
IT.SULA.HNN. 2021-09-20T20:58:41.45 0.1 undecidable manual P 9 0.2644 107 0.26 94
IV.RNI2.HHZ. 2021-09-20T20:58:41.12 0.1 undecidable manual P 116 0.2446 109 0.25 94
IV.CERA.HHZ. 2021-09-20T20:58:40.83 0.1 undecidable manual P 151 0.2446 109 -0.05 99
IT.OPI.HGE. 2021-09-20T20:58:40.45 0.3 undecidable manual S 211 0.0414 161 -0.13 76
IV.VVLD.HHZ. 2021-09-20T20:58:40.03 0.1 undecidable manual P 288 0.1844 117 0.1 98
IT.SULC.HNZ. 2021-09-20T20:58:40.89 0.3 undecidable manual P 8 0.2581 108 -0.2 71
IV.INTR.HHZ. 2021-09-20T20:58:40.21 0.1 negative manual P 10 0.2023 115 0.02 100
IV.POFI.HHZ. 2021-09-20T20:58:39.52 0.1 positive manual P 229 0.1448 126 0.18 98
IT.OPI.HGE. 2021-09-20T20:58:38.42 0.1 negative manual P 211 0.0414 161 0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.POFI.HHE. ML:1.6 0.000314 1.28 AML other m 2021-09-20T20:58:43.74
IV.POFI.HHN. ML:1.5 0.000213 1.38 AML other m 2021-09-20T20:58:43.82
IV.VVLD.HHN. ML:1.7 0.0002945 0.86 AML other m 2021-09-20T20:58:44.90
IV.INTR.HNE. ML:2.2 0.0008205 0.18 AML other m 2021-09-20T20:58:44.61
IV.INTR.HHE. ML:2.2 0.000884 0.18 AML other m 2021-09-20T20:58:44.70
IV.VVLD.HHE. ML:1.8 0.000372 0.42 AML other m 2021-09-20T20:58:44.76
IV.INTR.HNN. ML:2.1 0.000726 1.2 AML other m 2021-09-20T20:58:45.64
IV.INTR.HHN. ML:2.2 0.000826 1.18 AML other m 2021-09-20T20:58:45.63
IV.LRP.EHN. ML:1.2 7.625E-5 0.2 AML other m 2021-09-20T20:58:46.11
IV.LRP.EHE. ML:1.5 0.000143 0.3 AML other m 2021-09-20T20:58:46.27
IV.RNI2.HHN. ML:1.9 0.0003625 1.3 AML other m 2021-09-20T20:58:47.16
IV.CERA.HHE. ML:1.4 0.0001375 1.48 AML other m 2021-09-20T20:58:47.97
IV.CERA.HHN. ML:1.6 0.0002125 0.26 AML other m 2021-09-20T20:58:48.11
IV.MIDA.HHN. ML:1.8 0.0002035 0.34 AML other m 2021-09-20T20:58:48.36
IV.LPEL.HHN. ML:1.8 0.0002085 0.5 AML other m 2021-09-20T20:58:48.63
IV.LPEL.HHE. ML:1.8 0.000239 0.22 AML other m 2021-09-20T20:58:49.29
IV.MIDA.HHE. ML:1.8 0.0002175 0.26 AML other m 2021-09-20T20:58:49.62
IV.RNI2.HHE. ML:1.6 0.000177 0.34 AML other m 2021-09-20T20:58:50.05
IV.PTQR.HHN. ML:1 3.16E-5 1.32 AML other m 2021-09-20T20:58:50.22
IV.T0110.HHE. ML:2 0.0002695 0.26 AML other m 2021-09-20T20:58:52.55
IV.T0110.HHN. ML:1.9 0.000233 0.74 AML other m 2021-09-20T20:58:53.22
IV.TST02.HHN. ML:1.5 7.8E-5 0.4 AML other m 2021-09-20T20:58:53.43
IV.TST02.HHE. ML:1.7 0.0001285 0.5 AML other m 2021-09-20T20:58:54.14
IV.PTQR.HHE. ML:1.1 4.175E-5 0.42 AML other m 2021-09-20T20:58:55.01
IV.FAGN.HHN. ML:1.7 0.0001135 1.14 AML other m 2021-09-20T20:58:55.06
IV.FAGN.HHE. ML:1.8 0.000151 1.16 AML other m 2021-09-20T20:58:55.14
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