Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 21-10-2020 and time 07:51:11 (Italy) in region 4 km SE Bisegna (AQ)

A magnitude ML 1.1 earthquake occured in region: 4 km SE Bisegna (AQ), on

  • 21-10-2020 05:51:11 (UTC)
  • 21-10-2020 07:51:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.89, 13.78 at 13 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.

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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
Bisegna AQ 4 223 223
Villalago AQ 7 568 791
Scanno AQ 9 1847 2638
Lecce nei Marsi AQ 9 1702 4340
Pescasseroli AQ 9 2203 6543
Gioia dei Marsi AQ 10 1989 8532
Anversa degli Abruzzi AQ 12 341 8873
Ortona dei Marsi AQ 13 542 9415
Villavallelonga AQ 13 919 10334
Ortucchio AQ 13 1860 12194
Opi AQ 13 420 12614
Cocullo AQ 16 230 12844
Collelongo AQ 16 1233 14077
Bugnara AQ 16 1125 15202
Introdacqua AQ 16 2126 17328
Rocca Pia AQ 17 178 17506
Pettorano sul Gizio AQ 18 1376 18882
Villetta Barrea AQ 18 653 19535
Pescina AQ 18 4133 23668
San Benedetto dei Marsi AQ 18 3909 27577
Pescosolido FR 19 1555 29132
Campoli Appennino FR 19 1725 30857
Prezza AQ 19 945 31802
Civitella Alfedena AQ 19 296 32098

Municipalities with at least 50000 inhabitants

An earthquake occurred to
60 Km SE of L'Aquila (69753 inhabitants)
61 Km SW of Chieti (51815 inhabitants)
73 Km SW of Pescara (121014 inhabitants)
76 Km SW of Montesilvano (53738 inhabitants)
81 Km E of Tivoli (56533 inhabitants)
86 Km S of Teramo (54892 inhabitants)
86 Km E of Velletri (53303 inhabitants)
87 Km NE of Latina (125985 inhabitants)
88 Km E of Guidonia Montecelio (88673 inhabitants)
99 Km E of Aprilia (73446 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 1.1 2020-10-21
05:51:11		 41.89 13.78 13 2020-10-21
06:03:08		 Sala Sismica INGV-Roma 83978551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-21 05:51:11 ± 0.07
Latitude 41.89 ± 0.00
Longitude 13.78 ± 0.00
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83978551

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 342
Semi-minor axis of confidence ellipse (meter) 155
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 330
Circular confidence region, given by single value of horizontal uncertainty (meter) 340
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 86
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.61783
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 83978551
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-21 06:03:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PLLN.EHZ. 2020-10-21T05:53:11.24 3.0 undecidable manual Sg 10.8 0
MN.VAE.HHZ. 2020-10-21T05:53:06.29 3.0 undecidable manual Sn -7.28 0
IV.NDIM.HNZ. 2020-10-21T05:52:54.59 3.0 undecidable manual Sg 4.32 0
GU.GSCL.HHZ. 2020-10-21T05:52:51.67 3.0 undecidable manual Sg 8.09 0
IV.ILOS.HHZ. 2020-10-21T05:52:48.32 3.0 undecidable manual Sn -4.07 0
MN.TRI.HHZ. 2020-10-21T05:52:41.25 3.0 undecidable manual Sn -9.99 0
GU.CARD.HHZ. 2020-10-21T05:52:39.32 3.0 undecidable manual Sg -0.15 0
CH.BERNI.HHZ. 2020-10-21T05:52:34.83 3.0 negative manual Pg 6.34 0
IV.SCIAC.HHZ. 2020-10-21T05:52:16.06 3.0 negative manual Pn -2.48 0
IV.NDIM.HNZ. 2020-10-21T05:52:14.71 3.0 negative manual Pg 8.39 0
IV.MTGR.HHZ. 2020-10-21T05:52:11.98 3.0 positive manual Pn -1.9 0
IV.AGLI.HHZ. 2020-10-21T05:52:08.67 3.0 undecidable manual Pg 3.79 0
GU.CARD.HHZ. 2020-10-21T05:52:07.50 3.0 undecidable manual Pg 7.25 0
IV.PE3.EHZ. 2020-10-21T05:52:01.50 3.0 undecidable manual Sn -9.38 0
IV.BRSN.HNZ. 2020-10-21T05:51:54.79 3.0 negative manual Pg 1.54 0
IV.FIR.HHZ. 2020-10-21T05:51:44.98 3.0 undecidable manual Pn -7.31 0
IV.PE3.EHZ. 2020-10-21T05:51:43.42 3.0 undecidable manual Pg -0.77 0
IV.VTIR.HHZ. 2020-10-21T05:51:32.33 3.0 negative manual Pn -2.89 0
IV.FIAM.HNZ. 2020-10-21T05:51:23.44 1.0 undecidable manual P 308 0.6178 92 -0.34 22
IV.PTQR.HHZ. 2020-10-21T05:51:23.30 0.6 undecidable manual S 295 0.3094 96 -0.14 48
IV.FAGN.HHE. 2020-10-21T05:51:20.08 1.0 undecidable manual P 339 0.4002 94 0.01 24
IV.CERA.HHZ. 2020-10-21T05:51:19.51 1.0 negative manual P 149 0.3444 95 0.4 22
IV.POFI.HHZ. 2020-10-21T05:51:19.60 0.6 undecidable manual S 196 0.1808 106 -0.1 49
IV.T0110.HHZ. 2020-10-21T05:51:19.35 1.0 undecidable manual P 360 0.3372 95 0.35 23
IV.INTR.HHZ. 2020-10-21T05:51:18.89 0.6 undecidable manual S 38 0.152 112 0 50
IV.PTQR.HHZ. 2020-10-21T05:51:18.68 0.1 undecidable manual P 295 0.3094 96 0.16 95
IV.LPEL.HHZ. 2020-10-21T05:51:18.89 0.3 negative manual P 63 0.3381 95 -0.12 72
IT.OPI.HGZ. 2020-10-21T05:51:18.15 0.3 undecidable manual S 161 0.1223 121 0.07 76
IV.LRP.EHZ. 2020-10-21T05:51:17.89 1.0 undecidable manual P 210 0.2833 97 -0.19 24
IV.VVLD.HHZ. 2020-10-21T05:51:17.97 0.3 undecidable manual S 259 0.1178 122 0 76
IV.POFI.HHZ. 2020-10-21T05:51:16.28 0.6 negative manual P 196 0.1808 106 -0.08 49
IV.VVLD.HHZ. 2020-10-21T05:51:15.38 0.3 undecidable manual P 259 0.1178 122 0.02 76
IV.INTR.HHZ. 2020-10-21T05:51:15.81 0.1 positive manual P 38 0.152 112 -0.08 100
IT.OPI.HGZ. 2020-10-21T05:51:15.42 0.6 undecidable manual P 161 0.1223 121 0 51
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.INTR.HHE. ML:1.1 9.762351E-5 0.1824 AML other m 2020-10-21T05:51:18.89
IV.INTR.HHN. ML:1.2 0.00012786015 0.1792 AML other m 2020-10-21T05:51:20.27
IV.INTR.HNE. ML:1.3 0.00014825084425 0.512 AML other m 2020-10-21T05:51:18.52
IV.INTR.HNN. ML:1.3 0.00016941777 1.6192 AML other m 2020-10-21T05:51:19.26
IV.POFI.HHE. ML:1 7.7176365E-5 0.16 AML other m 2020-10-21T05:51:20.04
IV.POFI.HHN. ML:1.2 9.4973855E-5 0.24 AML other m 2020-10-21T05:51:20.26
IV.POFI.HNE. ML:1.2 0.000107805775 0.3104 AML other m 2020-10-21T05:51:22.94
IV.POFI.HNN. ML:1.3 0.000145589115 0.2496 AML other m 2020-10-21T05:51:20.27
IV.FIAM.HHE. ML:1.1 1.842491E-5 0.4416 AML other m 2020-10-21T05:51:36.21
IV.FIAM.HHN. ML:0.8 9.728462E-6 0.56 AML other m 2020-10-21T05:51:35.49
IV.LRP.EHE. ML:1.5 0.0001394356 0.16 AML other m 2020-10-21T05:51:23.39
IV.LRP.EHN. ML:1.1 5.194073E-5 0.24 AML other m 2020-10-21T05:51:22.76
IV.LPEL.HNE. ML:1.5 0.000110745615 0.6112 AML other m 2020-10-21T05:51:29.39
IV.LPEL.HNN. ML:1.5 0.000126438085 0.6496 AML other m 2020-10-21T05:51:24.15
IV.LPEL.HHE. ML:1.2 5.8963425E-5 0.08 AML other m 2020-10-21T05:51:25.27
IV.LPEL.HHN. ML:1.2 5.5854435E-5 0.1408 AML other m 2020-10-21T05:51:26.07
IV.T0110.HHE. ML:1.3 6.770615E-5 0.3808 AML other m 2020-10-21T05:51:27.99
IV.T0110.HHN. ML:1.2 5.344739E-5 0.3008 AML other m 2020-10-21T05:51:25.04
IV.CERA.HHE. ML:0.8 2.654235E-5 0.4608 AML other m 2020-10-21T05:51:32.01
IV.CERA.HHN. ML:0.8 2.4431955E-5 0.1984 AML other m 2020-10-21T05:51:26.42
IV.CERA.HNE. ML:1 3.9062475E-5 0.7616 AML other m 2020-10-21T05:51:38.68
IV.CERA.HNN. ML:1 3.799171E-5 0.8608 AML other m 2020-10-21T05:51:21.70
IV.PTQR.HHE. ML:0.8 2.325197E-5 0.1408 AML other m 2020-10-21T05:51:23.96
IV.PTQR.HHN. ML:0.7 2.2023865E-5 0.1568 AML other m 2020-10-21T05:51:24.78
IV.VTIR.HHE. ML:2.9 0.0004840442 0.08 AML other m 2020-10-21T05:51:57.08
IV.VTIR.HHN. ML:2.8 0.00044673655 0.1024 AML other m 2020-10-21T05:51:56.49
IV.PE3.EHE. ML:2.6 9.7937955E-5 0.0608 AML other m 2020-10-21T05:52:04.42
IV.PE3.EHN. ML:2.7 0.000115745608 0.08 AML other m 2020-10-21T05:52:04.45
IV.FIR.HNE. ML:3.4 0.0003366172 0.0704 AML other m 2020-10-21T05:51:58.42
IV.FIR.HNN. ML:3.4 0.00034629935 0.2112 AML other m 2020-10-21T05:51:49.38
IV.FIR.HHE. ML:3.5 0.00038402735 0.08 AML other m 2020-10-21T05:51:49.38
IV.FIR.HHN. ML:3.4 0.00034049145 0.08 AML other m 2020-10-21T05:51:56.95
IV.BRSN.HNE. ML:3.4 0.0003224418 0.4608 AML other m 2020-10-21T05:52:56.25
IV.BRSN.HNN. ML:3.4 0.00032493075 0.4896 AML other m 2020-10-21T05:52:49.82
IV.BRSN.EHE. ML:3.2 0.000213344 0.3808 AML other m 2020-10-21T05:52:38.40
IV.BRSN.EHN. ML:3.3 0.0002489224 0.48 AML other m 2020-10-21T05:52:49.83
GU.CARD.HHE. ML:2.5 2.471825E-5 0.16 AML other m 2020-10-21T05:52:45.52
GU.CARD.HHN. ML:2.6 2.810225E-5 0.2816 AML other m 2020-10-21T05:52:55.46
IV.AGLI.HHE. ML:3 5.5633925E-5 0.0608 AML other m 2020-10-21T05:52:14.71
IV.AGLI.HHN. ML:2.8 3.3183185E-5 1.2608 AML other m 2020-10-21T05:53:05.72
IV.NDIM.HHE. ML:4.3 0.001057992 0.08 AML other m 2020-10-21T05:52:57.71
IV.NDIM.HHN. ML:4.1 0.0007576947 0.3008 AML other m 2020-10-21T05:53:15.02
IV.NDIM.HNE. ML:4.3 0.00108496415 0.08 AML other m 2020-10-21T05:52:57.70
IV.NDIM.HNN. ML:4.3 0.0011825752 0.5984 AML other m 2020-10-21T05:52:51.70
IV.SCIAC.HHE. ML:3.2 4.5408895E-5 0.7392 AML other m 2020-10-21T05:53:27.56
IV.SCIAC.HHN. ML:3.2 4.6501975E-5 0.2016 AML other m 2020-10-21T05:53:26.57
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download