Earthquake with magnitude of ML 1.0 on date 20-09-2021 and time 22:55:24 (Italy) in region 4 km NE Opi (AQ)

A magnitude ML 1.0 earthquake occured in region: 4 km NE Opi (AQ), on

  • 20-09-2021 20:55:24 (UTC)
  • 20-09-2021 22:55:24 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.8100, 13.8570 at 15 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 11 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
Campoli Appennino FR 17 1725 14783
Alfedena AQ 17 864 15647
Rocca Pia AQ 17 178 15825
Gallinaro FR 18 1269 17094
Pescosolido FR 18 1555 18649
Picinisco FR 18 1218 19867
Posta Fibreno FR 18 1139 21006
Rivisondoli AQ 19 700 21706
Roccaraso AQ 19 1627 23333
Vicalvi FR 19 783 24116
Lecce nei Marsi AQ 20 1702 25818
Pescocostanzo AQ 20 1128 26946

Municipalities with at least 50000 inhabitants

An earthquake occurred to
66 Km SW of Chieti (51815 inhabitants)
71 Km SE of L'Aquila (69753 inhabitants)
79 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
Reviewed
Rev100
ML 1.0 2021-09-20
20:55:24
41.8102 13.857 15 2021-09-20
21:22:39
Sala Sismica INGV-Roma 95677141
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-20 20:55:24 ± 0.1
Latitude 41.8102 ± 0.0027
Longitude 13.8570 ± 0.0048
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95677141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 361
Semi-minor axis of confidence ellipse (meter) 223
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 50
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.03957
Epicentral distance of station farthest from the epicenter (degree) 0.42358
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 95677141
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-20 21:22:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.T0110.HHN. 2021-09-20T20:55:40.49 0.3 undecidable manual S 352 47.0196 96 0.47 65
IV.MIDA.HHZ. 2021-09-20T20:55:37.63 0.3 undecidable manual S 119 37.8288 99 0.05 72
IV.LPEL.HHZ. 2021-09-20T20:55:37.58 0.3 undecidable manual S 46 37.629 99 0.04 72
IV.RNI2.HHN. 2021-09-20T20:55:35.07 0.6 undecidable manual S 116 27.1506 105 0.27 47
IT.SULP.HGE. 2021-09-20T20:55:35.90 0.3 undecidable manual S 11 31.0467 102 0.09 72
IV.CERA.HNE. 2021-09-20T20:55:34.56 0.3 undecidable manual S 150 27.0507 105 -0.22 71
IV.VVLD.HHZ. 2021-09-20T20:55:33.01 0.3 undecidable manual S 289 20.4684 113 -0.09 74
IV.INTR.HHZ. 2021-09-20T20:55:33.45 0.3 undecidable manual S 10 22.6551 109 -0.21 71
IV.T0110.HHN. 2021-09-20T20:55:33.56 0.1 undecidable manual P 352 47.0196 96 -0.09 94
IV.LPEL.HHZ. 2021-09-20T20:55:32.21 0.3 undecidable manual P 46 37.629 99 -0.01 73
IV.POFI.HHZ. 2021-09-20T20:55:31.98 0.3 undecidable manual S 229 15.7731 122 -0.02 75
IT.SULP.HGE. 2021-09-20T20:55:31.04 0.3 undecidable manual P 11 31.0467 102 -0.19 71
IV.MIDA.HHZ. 2021-09-20T20:55:31.94 0.1 undecidable manual P 119 37.8288 99 -0.31 91
IV.RNI2.HHN. 2021-09-20T20:55:31.00 0.1 undecidable manual P 116 27.1506 105 0.36 92
IV.CERA.HNE. 2021-09-20T20:55:30.54 0.1 undecidable manual P 150 27.0507 105 -0.09 97
IV.INTR.HHZ. 2021-09-20T20:55:29.82 0.1 undecidable manual P 10 22.6551 109 -0.16 96
IV.POFI.HHZ. 2021-09-20T20:55:29.11 0.1 positive manual P 229 15.7731 122 0.09 99
IT.OPI.HGZ. 2021-09-20T20:55:29.98 0.3 undecidable manual S 211 4.3956 160 -0.06 75
IV.VVLD.HHZ. 2021-09-20T20:55:29.63 0.1 undecidable manual P 289 20.4684 113 -0.02 100
IT.OPI.HGZ. 2021-09-20T20:55:28.05 0.1 undecidable manual P 211 4.3956 160 0.16 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LPEL.HHE. ML:1.0 0.00003945 1.04 AML other m 2021-09-20T20:55:38.90
IV.LPEL.HHN. ML:1.0 0.000034250000000000006 0.56 AML other m 2021-09-20T20:55:40.90
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