Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 06-02-2021 and time 06:39:57 (Italy) in region 5 km W Accumoli (RI)

A magnitude ML 0.9 earthquake occured in region: 5 km W Accumoli (RI), on

  • 06-02-2021 05:39:57 (UTC)
  • 06-02-2021 06:39:57 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.6970, 13.1820 at 11 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 6 667 667
Cittareale RI 9 482 1149
Amatrice RI 12 2657 3806
Arquata del Tronto AP 13 1178 4984
Norcia PG 13 4957 9941
Cascia PG 14 3217 13158
Monteleone di Spoleto PG 19 599 13757
Montereale AQ 20 2581 16338

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km NW of L'Aquila (69753 inhabitants)
43 Km W of Teramo (54892 inhabitants)
46 Km E of Terni (111501 inhabitants)
48 Km SE of Foligno (57155 inhabitants)
79 Km SE of Perugia (166134 inhabitants)
82 Km W of Montesilvano (53738 inhabitants)
86 Km NE of Guidonia Montecelio (88673 inhabitants)
87 Km NE of Tivoli (56533 inhabitants)
88 Km W of Pescara (121014 inhabitants)
90 Km W of Chieti (51815 inhabitants)
93 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 0.9 2021-02-06
05:39:57		 42.6973 13.1817 11 2021-07-12
16:55:04		 Bollettino Sismico Italiano INGV 88682921
Reviewed
Rev100 		ML 0.9 2021-02-06
05:39:57		 42.6982 13.1827 15 2021-02-06
05:44:28		 Sala Sismica INGV-Roma 86873731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-06 05:39:57 ± 0.05
Latitude 42.6973 ± 0.0027
Longitude 13.1817 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88682921

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 308
Semi-minor axis of confidence ellipse (meter) 243
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 238
Circular confidence region, given by single value of horizontal uncertainty (meter) 310.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 68
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.09713
Epicentral distance of station farthest from the epicenter (degree) 0.39480
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 86873731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-06 05:44:28

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 88682921
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-01 15:48:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHE. 2021-02-06T05:40:12.26 0.6 undecidable manual S 2 43.8228 50 0.28 46
IV.MF5.EHN. 2021-02-06T05:40:11.23 0.3 undecidable manual S 35 39.3273 50 0.44 67
IV.CESI.HHE. 2021-02-06T05:40:11.26 0.6 undecidable manual S 327 40.9257 50 0.06 48
IV.FDMO.HHZ. 2021-02-06T05:40:10.60 0.3 undecidable manual S 349 38.4282 50 0.06 72
IV.TERO.HHZ. 2021-02-06T05:40:09.40 0.3 undecidable manual S 103 35.4423 50 -0.34 69
IV.GAVE.EHZ. 2021-02-06T05:40:06.60 0.3 undecidable manual S 269 23.4543 50 0.06 74
IV.MMO1.EHZ. 2021-02-06T05:40:06.90 0.3 undecidable manual S 28 25.3524 50 -0.15 73
IV.MC2.EHZ. 2021-02-06T05:40:06.80 0.3 undecidable manual S 1 23.754 50 0.17 72
IV.CESI.HHE. 2021-02-06T05:40:05.60 0.3 undecidable manual P 327 40.9257 50 0.06 72
IV.MF5.EHN. 2021-02-06T05:40:05.73 0.6 undecidable manual P 35 39.3273 50 0.43 45
IV.RM33.EHZ. 2021-02-06T05:40:05.70 0.1 undecidable manual S 173 21.0678 50 -0.21 96
IV.CSP1.EHE. 2021-02-06T05:40:05.99 0.3 undecidable manual P 2 43.8228 50 0.01 72
IV.FDMO.HHZ. 2021-02-06T05:40:04.99 0.3 undecidable manual P 349 38.4282 50 -0.16 71
IV.SMA1.EHZ. 2021-02-06T05:40:04.20 0.3 undecidable manual S 121 14.5743 127 0.08 75
IV.LNSS.HHZ. 2021-02-06T05:40:04.50 0.1 undecidable manual S 228 15.5733 125 0.1 100
IV.TERO.HHZ. 2021-02-06T05:40:04.42 0.3 undecidable manual P 103 35.4423 50 -0.27 70
IV.NRCA.HHZ. 2021-02-06T05:40:04.12 0.1 undecidable manual S 340 16.0728 124 -0.43 93
IV.T1299.EHZ. 2021-02-06T05:40:03.25 0.6 undecidable manual S 130 10.7781 135 0.12 50
IV.MC2.EHZ. 2021-02-06T05:40:02.95 0.3 undecidable manual P 1 23.754 50 0.05 74
IV.MMO1.EHZ. 2021-02-06T05:40:02.95 0.3 undecidable manual P 28 25.3524 50 -0.19 72
IV.GAVE.EHZ. 2021-02-06T05:40:02.85 0.3 undecidable manual P 269 23.4543 50 0 75
IV.RM33.EHZ. 2021-02-06T05:40:02.45 0.1 undecidable manual P 173 21.0678 50 -0.03 100
IV.LNSS.HHZ. 2021-02-06T05:40:01.72 0.1 undecidable manual P 228 15.5733 125 0.11 99
IV.SMA1.EHZ. 2021-02-06T05:40:01.55 0.1 undecidable manual P 121 14.5743 127 0.1 100
IV.T1299.EHZ. 2021-02-06T05:40:01.12 0.3 undecidable manual P 130 10.7781 135 0.25 73
IV.NRCA.HHZ. 2021-02-06T05:40:01.54 0.1 undecidable manual P 340 16.0728 124 -0.16 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.0 0.00008269999999999999 0.2 AML other m 2021-02-06T05:40:04.39
IV.NRCA.HHN. ML:0.9 0.00006610000000000001 0.46 AML other m 2021-02-06T05:40:04.21
IV.LNSS.HHN. ML:0.8 0.00005945 1.1 AML other m 2021-02-06T05:40:04.56
IV.LNSS.HHE. ML:1.0 0.0000859 0.28 AML other m 2021-02-06T05:40:04.75
IV.SMA1.EHN. ML:0.8 0.00006455 0.4 AML other m 2021-02-06T05:40:04.88
IV.SMA1.EHE. ML:0.7 0.00005185 0.18 AML other m 2021-02-06T05:40:04.69
IV.GAVE.EHE. ML:0.9 0.00005145 1.38 AML other m 2021-02-06T05:40:07.26
IV.GAVE.EHN. ML:0.8 0.0000424 0.82 AML other m 2021-02-06T05:40:08.95
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