Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 06-02-2021 and time 00:37:56 (UTC) in region 4 km SW Accumoli (RI)

A magnitude ML 1.1 earthquake occured in region: 4 km SW Accumoli (RI), on

  • 06-02-2021 00:37:56 (UTC)
  • 06-02-2021 01:37:56 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.6720, 13.2180 at 12 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 4 667 667
Amatrice RI 7 2657 3324
Cittareale RI 8 482 3806
Arquata del Tronto AP 13 1178 4984
Montereale AQ 17 2581 7565
Norcia PG 17 4957 12522
Cascia PG 18 3217 15739
Campotosto AQ 18 542 16281
Capitignano AQ 18 665 16946
Borbona RI 19 617 17563
Acquasanta Terme AP 19 2916 20479
Posta RI 19 694 21173

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km NW of L'Aquila (69753 inhabitants)
40 Km W of Teramo (54892 inhabitants)
48 Km E of Terni (111501 inhabitants)
53 Km SE of Foligno (57155 inhabitants)
78 Km W of Montesilvano (53738 inhabitants)
83 Km SE of Perugia (166134 inhabitants)
85 Km NE of Guidonia Montecelio (88673 inhabitants)
85 Km W of Pescara (121014 inhabitants)
86 Km W of Chieti (51815 inhabitants)
86 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 1.1 2021-02-06
00:37:56		 42.6722 13.2183 13 2021-07-12
16:55:00		 Bollettino Sismico Italiano INGV 87602561
Reviewed
Rev100 		ML 1.0 2021-02-06
00:37:57		 42.6843 13.207 8 2021-02-06
00:47:33		 Sala Sismica INGV-Roma 86867871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-06 00:37:56 ± 0.05
Latitude 42.6722 ± 0.0027
Longitude 13.2183 ± 0.0049
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87602561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 303
Semi-minor axis of confidence ellipse (meter) 251
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 242
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) 52
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.06025
Epicentral distance of station farthest from the epicenter (degree) 0.55218
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 21
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 87602561
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-07 09:41:00

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 86867871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-06 00:47:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2021-02-06T00:38:10.24 0.6 undecidable manual S 345 41.8248 93 -0.12 47
IV.ASSB.HHN. 2021-02-06T00:38:08.05 0.6 undecidable manual P 312 61.2942 92 0.45 42
IV.TERO.HHZ. 2021-02-06T00:38:07.38 0.6 undecidable manual S 100 31.9458 94 -0.35 46
IV.MNTT.EHZ. 2021-02-06T00:38:06.72 0.6 undecidable manual P 35 53.0025 92 0.39 43
IV.MMO1.EHZ. 2021-02-06T00:38:06.33 0.3 undecidable manual S 19 26.751 96 -0.01 74
IV.GAVE.EHZ. 2021-02-06T00:38:06.14 0.3 undecidable manual S 275 26.5512 96 -0.15 72
IV.MC2.EHZ. 2021-02-06T00:38:06.66 1.0 undecidable manual S 355 26.6511 96 0.34 23
IV.MOMA.HNZ. 2021-02-06T00:38:06.89 0.6 undecidable manual P 286 54.8007 92 0.29 44
IV.CESI.HNZ. 2021-02-06T00:38:05.41 0.6 undecidable manual P 325 44.9217 93 0.34 45
IV.CSP1.EHZ. 2021-02-06T00:38:05.34 0.6 undecidable manual P 359 46.5201 92 0.01 48
IV.NRCA.HHZ. 2021-02-06T00:38:04.12 0.3 undecidable manual S 335 19.7691 101 -0.4 69
IV.GUMA.HHZ. 2021-02-06T00:38:04.55 0.6 undecidable manual P 12 44.3223 93 -0.44 44
IV.CAMP.HHZ. 2021-02-06T00:38:04.94 0.3 undecidable manual S 134 21.6672 99 -0.08 74
IV.FDMO.HHZ. 2021-02-06T00:38:04.39 0.6 undecidable manual P 345 41.8248 93 -0.21 46
IV.MF5.EHZ. 2021-02-06T00:38:04.42 0.6 undecidable manual P 29 40.1265 93 0.08 47
IV.RM33.EHZ. 2021-02-06T00:38:04.05 0.3 undecidable manual S 181 18.0708 104 -0.02 75
IV.FIAM.HNZ. 2021-02-06T00:38:04.92 0.3 undecidable manual P 190 45.621 93 -0.26 68
IV.GIGS.HJZ. 2021-02-06T00:38:03.90 0.6 undecidable manual P 130 37.8288 93 -0.08 48
IV.MTRA.EHZ. 2021-02-06T00:38:03.62 0.3 undecidable manual S 57 17.2716 106 -0.24 71
IV.LNSS.HHZ. 2021-02-06T00:38:03.58 0.3 undecidable manual S 242 16.4724 108 -0.06 74
IV.SMA1.EHZ. 2021-02-06T00:38:02.38 0.3 undecidable manual S 116 10.5783 127 0.12 75
IV.GAVE.EHZ. 2021-02-06T00:38:02.21 0.3 undecidable manual P 275 26.5512 96 -0.04 74
IV.TERO.HHZ. 2021-02-06T00:38:02.91 0.3 undecidable manual P 100 31.9458 94 -0.17 71
IV.MC2.EHZ. 2021-02-06T00:38:02.58 0.3 undecidable manual P 355 26.6511 96 0.31 70
IV.MMO1.EHZ. 2021-02-06T00:38:02.26 0.3 undecidable manual P 19 26.751 96 -0.02 74
IV.RM33.EHZ. 2021-02-06T00:38:01.07 0.3 undecidable manual P 181 18.0708 104 0.1 74
IV.CAMP.HHZ. 2021-02-06T00:38:01.83 0.6 undecidable manual P 134 21.6672 99 0.31 47
IV.NRCA.HHZ. 2021-02-06T00:38:01.14 0.1 negative manual P 335 19.7691 101 -0.09 98
IV.T1299.HNZ. 2021-02-06T00:38:01.44 0.3 undecidable manual S 129 6.6933 144 -0.08 74
IV.SMA1.EHZ. 2021-02-06T00:38:00.15 0.1 undecidable manual P 116 10.5783 127 0.23 97
IV.MTRA.EHZ. 2021-02-06T00:38:00.83 0.1 undecidable manual P 57 17.2716 106 -0.02 100
IV.LNSS.HHZ. 2021-02-06T00:38:00.79 0.1 positive manual P 242 16.4724 108 0.07 99
IV.T1299.HNZ. 2021-02-06T00:37:59.68 0.3 undecidable manual P 129 6.6933 144 0.18 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:1.3 0.0001955 0.32 AML other m 2021-02-06T00:38:02.78
IV.SMA1.EHE. ML:1.4 0.0002945 0.3 AML other m 2021-02-06T00:38:02.84
IV.LNSS.HHN. ML:1.2 0.0001365 0.36 AML other m 2021-02-06T00:38:03.69
IV.MTRA.EHN. ML:0.8 0.00004885 0.14 AML other m 2021-02-06T00:38:03.73
IV.LNSS.HHE. ML:1.3 0.0001645 0.32 AML other m 2021-02-06T00:38:03.81
IV.NRCA.HHE. ML:1.3 0.00013700000000000002 0.16 AML other m 2021-02-06T00:38:04.47
IV.MTRA.EHE. ML:0.9 0.00006659999999999999 0.24 AML other m 2021-02-06T00:38:04.57
IV.NRCA.HHN. ML:1.2 0.00009884999999999999 0.16 AML other m 2021-02-06T00:38:04.60
IV.RM33.EHN. ML:0.9 0.000053400000000000004 0.86 AML other m 2021-02-06T00:38:04.76
IV.RM33.EHE. ML:1.0 0.00007725 1.68 AML other m 2021-02-06T00:38:05.06
IV.GAVE.EHN. ML:1.2 0.00008165 0.7 AML other m 2021-02-06T00:38:06.89
IV.GAVE.EHE. ML:1.2 0.00007555 0.72 AML other m 2021-02-06T00:38:06.97
IV.TERO.HHN. ML:0.9 0.000036150000000000005 0.78 AML other m 2021-02-06T00:38:07.47
IV.TERO.HHE. ML:0.8 0.0000248 0.62 AML other m 2021-02-06T00:38:11.16
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