Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 11-11-2021 and time 22:31:16 (Italy) in region 8 km NW Accumoli (RI)

A magnitude ML 1.5 earthquake occured in region: 8 km NW Accumoli (RI), on

  • 11-11-2021 21:31:16 (UTC)
  • 11-11-2021 22:31:16 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7460, 13.1810 at 10 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
Accumoli RI 8 667 667
Norcia PG 9 4957 5624
Arquata del Tronto AP 10 1178 6802
Cascia PG 14 3217 10019
Cittareale RI 14 482 10501
Amatrice RI 16 2657 13158
Montegallo AP 17 523 13681
Castelsantangelo sul Nera MC 17 281 13962
Acquasanta Terme AP 19 2916 16878
Preci PG 19 724 17602

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km W of Teramo (54892 inhabitants)
45 Km SE of Foligno (57155 inhabitants)
47 Km NW of L'Aquila (69753 inhabitants)
48 Km E of Terni (111501 inhabitants)
76 Km SE of Perugia (166134 inhabitants)
83 Km W of Montesilvano (53738 inhabitants)
90 Km W of Pescara (121014 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km W of Chieti (51815 inhabitants)
92 Km NE of Tivoli (56533 inhabitants)
95 Km E of Viterbo (67173 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 2021-11-11
21:31:16		 42.7455 13.1812 10 2022-03-30
13:04:36		 Bollettino Sismico Italiano INGV 100775371
Reviewed
Rev100 		ML 1.6 2021-11-11
21:31:16		 42.7447 13.1805 10 2021-11-11
21:49:30		 Sala Sismica INGV-Roma 97401971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-11 21:31:16 ± 0.05
Latitude 42.7455 ± 0.0027
Longitude 13.1812 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 100775371

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 297
Semi-minor axis of confidence ellipse (meter) 254
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 98
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) 75
Number of associated phases, regardless of their use for origin computation 43
Number of defining phases 43
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) 0.10072
Epicentral distance of station farthest from the epicenter (degree) 0.62953
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 39
Type of magnitude ML
Reference to an origin 100775371
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-08 12:50:23

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 32
Type of magnitude ML
Reference to an origin 97401971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-11 21:49:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-11-11T21:31:37.13 0.6 undecidable manual S 354 65.0904 50 0.44 42
IV.SAP2.EHE. 2021-11-11T21:31:31.23 0.3 undecidable manual S 24 42.8238 50 0.49 65
IV.PF6.EHN. 2021-11-11T21:31:30.69 0.3 undecidable manual S 1 43.5231 50 -0.25 68
IV.CING.HHZ. 2021-11-11T21:31:29.31 0.6 undecidable manual P 1 69.8745 50 0.33 43
IV.MF5.EHZ. 2021-11-11T21:31:29.02 0.3 undecidable manual S 40 35.1426 50 0.33 68
IV.CSP1.EHZ. 2021-11-11T21:31:29.42 0.3 undecidable manual S 3 38.4282 50 -0.16 70
IV.GUMA.HHZ. 2021-11-11T21:31:29.73 0.3 undecidable manual S 20 37.3293 50 0.44 66
IV.TERO.HHZ. 2021-11-11T21:31:28.93 0.3 undecidable manual S 111 37.0296 50 -0.28 69
IV.CESI.HHZ. 2021-11-11T21:31:28.72 0.3 undecidable manual S 322 36.5412 50 -0.35 68
IV.EL6.EHZ. 2021-11-11T21:31:28.64 0.6 undecidable manual P 354 65.0904 50 0.4 42
IT.MTCL.HGZ. 2021-11-11T21:31:27.30 0.3 undecidable manual S 332 31.2465 50 -0.37 68
IV.FDMO.HHZ. 2021-11-11T21:31:27.87 0.3 undecidable manual S 347 33.1446 50 -0.3 69
IV.CAMP.HHE. 2021-11-11T21:31:26.82 0.3 undecidable manual S 141 29.748 50 -0.44 67
IV.MNTT.EHZ. 2021-11-11T21:31:26.18 0.3 undecidable manual P 44 48.618 50 0.47 65
IV.CESX.HHZ. 2021-11-11T21:31:26.39 0.3 undecidable manual P 253 50.8158 50 0.35 66
IV.FEMA.HNZ. 2021-11-11T21:31:25.95 0.3 undecidable manual S 336 26.2515 50 -0.38 68
IV.GAVE.EHZ. 2021-11-11T21:31:25.72 0.3 undecidable manual S 256 24.1536 50 -0.04 74
IV.OFFI.HHZ. 2021-11-11T21:31:25.29 0.6 undecidable manual P 63 46.1205 50 -0.03 47
IV.SAP2.EHE. 2021-11-11T21:31:25.26 0.3 undecidable manual P 24 42.8238 50 0.45 66
IV.LNSS.HHZ. 2021-11-11T21:31:24.42 0.3 undecidable manual S 216 19.5693 118 0.04 74
IV.ARRO.EHZ. 2021-11-11T21:31:24.51 0.6 undecidable manual P 242 38.628 50 0.35 45
IV.MMO1.EHZ. 2021-11-11T21:31:24.53 0.3 undecidable manual S 35 20.7681 117 -0.23 71
IV.CSP1.EHZ. 2021-11-11T21:31:24.00 0.1 undecidable manual P 3 38.4282 50 -0.14 94
IV.PF6.EHN. 2021-11-11T21:31:24.69 0.3 undecidable manual P 1 43.5231 50 -0.23 69
IV.MC2.EHZ. 2021-11-11T21:31:24.08 0.3 undecidable manual S 2 18.4704 119 0.04 75
IV.GUMA.HHZ. 2021-11-11T21:31:24.16 0.1 undecidable manual P 20 37.3293 50 0.19 93
IV.MF5.EHZ. 2021-11-11T21:31:23.84 0.1 undecidable manual P 40 35.1426 50 0.22 93
IV.FDMO.HHZ. 2021-11-11T21:31:23.14 0.3 undecidable manual P 347 33.1446 50 -0.18 71
IV.MTRA.EHZ. 2021-11-11T21:31:23.41 0.3 undecidable manual S 86 17.5713 121 -0.38 70
IV.TERO.HHZ. 2021-11-11T21:31:23.67 0.3 undecidable manual P 111 37.0296 50 -0.25 69
IV.SMA1.EHZ. 2021-11-11T21:31:23.87 0.3 undecidable manual S 135 17.871 120 -0.02 75
IV.CESI.HHZ. 2021-11-11T21:31:23.82 0.3 undecidable manual P 322 36.5412 50 -0.02 73
IT.MTCL.HGZ. 2021-11-11T21:31:22.80 0.1 undecidable manual P 332 31.2465 50 -0.23 93
IV.CAMP.HHE. 2021-11-11T21:31:22.89 0.3 undecidable manual P 141 29.748 50 0.09 72
IV.FEMA.HNZ. 2021-11-11T21:31:22.33 0.6 undecidable manual P 336 26.2515 50 0.06 49
IV.GAVE.EHZ. 2021-11-11T21:31:21.95 0.1 undecidable manual P 256 24.1536 50 0.02 99
IV.NRCA.HNZ. 2021-11-11T21:31:21.85 0.3 undecidable manual S 331 11.1777 133 -0.15 74
IV.MC2.EHZ. 2021-11-11T21:31:21.02 0.1 negative manual P 2 18.4704 119 0.09 99
IV.LNSS.HHZ. 2021-11-11T21:31:21.28 0.1 undecidable manual P 216 19.5693 118 0.14 97
IV.MMO1.EHZ. 2021-11-11T21:31:21.26 0.1 positive manual P 35 20.7681 117 -0.1 98
IV.SMA1.EHZ. 2021-11-11T21:31:20.97 0.3 undecidable manual P 135 17.871 120 0.12 73
IV.MTRA.EHZ. 2021-11-11T21:31:20.77 0.1 undecidable manual P 86 17.5713 121 -0.02 100
IV.NRCA.HNZ. 2021-11-11T21:31:19.92 0.1 negative manual P 331 11.1777 133 0.16 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.HNE. ML:1.6 0.00030169509999999997 0.2688 AML other m 2021-11-11T21:31:23.77
IV.MTRA.EHE. ML:1.6 0.0003121305 0.2816 AML other m 2021-11-11T21:31:23.64
IV.MTRA.EHN. ML:1.5 0.0002515 0.76 AML other m 2021-11-11T21:31:23.90
IV.MTRA.HNN. ML:1.5 0.000263 1.32 AML other m 2021-11-11T21:31:23.90
IV.MMO1.EHN. ML:1.8 0.00041478195 0.1024 AML other m 2021-11-11T21:31:24.58
IV.MMO1.EHE. ML:1.7 0.00035650000000000005 0.14 AML other m 2021-11-11T21:31:24.57
IV.LNSS.HHE. ML:1.5 0.00023899999999999998 0.26 AML other m 2021-11-11T21:31:24.86
IV.LNSS.HNE. ML:1.5 0.0002252896 0.2048 AML other m 2021-11-11T21:31:24.97
IV.LNSS.HHN. ML:1.5 0.000262 0.12 AML other m 2021-11-11T21:31:25.03
IV.LNSS.HNN. ML:1.5 0.0002345073 0.128 AML other m 2021-11-11T21:31:25.03
IV.MC2.EHN. ML:1.8 0.0005486782999999999 0.2688 AML other m 2021-11-11T21:31:25.40
IV.MC2.EHE. ML:1.8 0.0004895 0.12 AML other m 2021-11-11T21:31:25.76
IV.GAVE.EHN. ML:1.4 0.00014000000000000001 1.18 AML other m 2021-11-11T21:31:26.33
IV.GAVE.HNE. ML:1.4 0.000138487565 0.2304 AML other m 2021-11-11T21:31:27.18
IV.GAVE.EHE. ML:1.4 0.00015400000000000003 0.16 AML other m 2021-11-11T21:31:27.48
IV.FDMO.HHN. ML:1.1 0.00005505 0.22 AML other m 2021-11-11T21:31:28.30
IV.FDMO.HHE. ML:1.2 0.00006355 0.74 AML other m 2021-11-11T21:31:28.32
IV.CESI.HHN. ML:1.2 0.000061 0.52 AML other m 2021-11-11T21:31:29.22
IV.SMA1.EHN. ML:1.1 0.00010975 0.38 AML other m 2021-11-11T21:31:29.46
IV.TERO.HHN. ML:1.2 0.000059690640000000004 0.0768 AML other m 2021-11-11T21:31:29.95
IV.CSP1.EHE. ML:1.5 0.00012723263 0.2432 AML other m 2021-11-11T21:31:29.96
IV.CESI.HHE. ML:0.9 0.00002917557 0.1152 AML other m 2021-11-11T21:31:30.01
IV.MF5.EHE. ML:1.1 0.000056195999999999995 0.3968 AML other m 2021-11-11T21:31:30.05
IV.MF5.EHN. ML:1.2 0.00007099464499999999 0.3584 AML other m 2021-11-11T21:31:30.09
IV.GUMA.HHE. ML:2.1 0.000497 0.26 AML other m 2021-11-11T21:31:30.26
IV.GUMA.HNN. ML:2.0 0.000359 0.28 AML other m 2021-11-11T21:31:30.25
IV.CSP1.EHN. ML:1.6 0.000158170515 0.2176 AML other m 2021-11-11T21:31:30.42
IV.GUMA.HHN. ML:1.8 0.00022799999999999999 0.5 AML other m 2021-11-11T21:31:30.11
IV.GUMA.HNE. ML:1.8 0.0002605 0.22 AML other m 2021-11-11T21:31:30.37
IV.SMA1.EHE. ML:1.1 0.000112 0.5 AML other m 2021-11-11T21:31:30.42
IV.TERO.HHE. ML:1.4 0.00010282274499999999 0.3712 AML other m 2021-11-11T21:31:33.40
IV.MNTT.EHN. ML:1.5 0.00007940035 0.1408 AML other m 2021-11-11T21:31:35.51
IV.MNTT.EHE. ML:1.6 0.000105045135 0.2688 AML other m 2021-11-11T21:31:36.09
IV.CING.HHN. ML:1.1 0.0000219 0.62 AML other m 2021-11-11T21:31:39.07
IV.CING.HHE. ML:1.0 0.000014583773000000002 0.1152 AML other m 2021-11-11T21:31:40.84
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