Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 06-10-2021 and time 06:18:55 (Italy) in region 3 km SE Accumoli (RI)

A magnitude ML 1.6 earthquake occured in region: 3 km SE Accumoli (RI), on

  • 06-10-2021 04:18:55 (UTC)
  • 06-10-2021 06:18:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6690, 13.2600 at 13 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 3 667 667
Amatrice RI 5 2657 3324
Cittareale RI 10 482 3806
Arquata del Tronto AP 12 1178 4984
Campotosto AQ 15 542 5526
Montereale AQ 16 2581 8107
Acquasanta Terme AP 17 2916 11023
Capitignano AQ 17 665 11688
Norcia PG 19 4957 16645

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km W of Teramo (54892 inhabitants)
37 Km NW of L'Aquila (69753 inhabitants)
52 Km E of Terni (111501 inhabitants)
56 Km SE of Foligno (57155 inhabitants)
75 Km W of Montesilvano (53738 inhabitants)
81 Km W of Pescara (121014 inhabitants)
82 Km W of Chieti (51815 inhabitants)
86 Km SE of Perugia (166134 inhabitants)
86 Km NE of Guidonia Montecelio (88673 inhabitants)
87 Km NE of Tivoli (56533 inhabitants)
99 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 1.6 2021-10-06
04:18:55		 42.6692 13.2605 13 2022-03-30
13:04:13		 Bollettino Sismico Italiano INGV 96880471
Reviewed
Rev100 		ML 1.6 2021-10-06
04:18:55		 42.6732 13.2332 10 2021-10-06
04:28:15		 Sala Sismica INGV-Roma 96277931
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-06 04:18:55 ± 0.05
Latitude 42.6692 ± 0.0027
Longitude 13.2605 ± 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 96880471

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 410
Semi-minor axis of confidence ellipse (meter) 88
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 70
Circular confidence region, given by single value of horizontal uncertainty (meter) 410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 32
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) 0.03867
Epicentral distance of station farthest from the epicenter (degree) 0.42538
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 96880471
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-16 10:34:18

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 96277931
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-06 04:28:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CESI.HHZ. 2021-10-06T04:19:10.11 0.6 undecidable manual S 322 47.2194 93 0.01 47
IV.CSP1.EHZ. 2021-10-06T04:19:10.37 0.6 undecidable manual S 355 47.1195 93 0.29 45
IV.FDMO.HHZ. 2021-10-06T04:19:09.01 0.6 undecidable manual S 341 43.1235 93 -0.01 48
IV.FIAM.HHZ. 2021-10-06T04:19:09.95 0.6 undecidable manual S 195 46.0206 93 0.16 46
IV.GIGS.HHN. 2021-10-06T04:19:06.62 0.6 undecidable manual S 133 35.0427 94 -0.24 47
IV.MC2.EHZ. 2021-10-06T04:19:05.11 0.6 undecidable manual S 348 27.5502 97 0.25 47
IV.GAVE.EHN. 2021-10-06T04:19:05.31 0.6 undecidable manual S 275 29.9478 96 -0.21 46
IV.TERO.HHZ. 2021-10-06T04:19:04.44 0.6 undecidable manual S 100 28.4493 96 -0.69 42
IV.MMO1.EHZ. 2021-10-06T04:19:04.39 0.6 undecidable manual S 12 26.1516 97 -0.1 48
IV.CSP1.EHZ. 2021-10-06T04:19:03.67 0.1 undecidable manual P 355 47.1195 93 -0.06 94
IV.GUMA.HHZ. 2021-10-06T04:19:03.63 0.3 undecidable manual P 8 44.1225 93 0.37 66
IV.FDMO.HHZ. 2021-10-06T04:19:03.04 0.3 undecidable manual P 341 43.1235 93 -0.07 71
IV.CESI.HHZ. 2021-10-06T04:19:03.59 0.3 undecidable manual P 322 47.2194 93 -0.15 69
IV.FIAM.HHZ. 2021-10-06T04:19:03.66 0.3 undecidable manual P 195 46.0206 93 0.1 70
IV.NRCA.HNZ. 2021-10-06T04:19:02.89 0.6 undecidable manual S 327 21.7671 101 -0.47 45
IV.RM33.EHZ. 2021-10-06T04:19:02.41 0.6 undecidable manual S 192 18.1707 106 0 50
IV.MF5.EHZ. 2021-10-06T04:19:02.93 0.1 undecidable manual P 25 38.9277 94 0.47 87
IV.CAMP.HHE. 2021-10-06T04:19:02.56 0.6 undecidable manual S 141 19.1697 104 -0.1 49
IV.GIGS.HHN. 2021-10-06T04:19:01.75 0.3 undecidable manual P 133 35.0427 94 -0.11 71
IV.MTRA.HNZ. 2021-10-06T04:19:01.17 0.6 undecidable manual S 49 14.7741 114 -0.38 47
IV.TERO.HHZ. 2021-10-06T04:19:00.88 0.1 undecidable manual P 100 28.4493 96 0.02 98
IV.MC2.EHZ. 2021-10-06T04:19:00.72 0.3 undecidable manual P 348 27.5502 97 0.01 74
IV.MMO1.EHZ. 2021-10-06T04:19:00.43 0.1 undecidable manual P 12 26.1516 97 -0.07 97
IV.GAVE.EHN. 2021-10-06T04:19:00.99 0.3 undecidable manual P 275 29.9478 96 -0.1 72
IV.NRCA.HNZ. 2021-10-06T04:18:59.72 0.1 undecidable manual P 327 21.7671 101 -0.12 97
IV.T1299.HNN. 2021-10-06T04:18:59.34 0.6 undecidable manual S 155 4.2957 157 -0.22 49
IV.CAMP.HHE. 2021-10-06T04:18:59.52 0.1 undecidable manual P 141 19.1697 104 0.08 98
IV.RM33.EHZ. 2021-10-06T04:18:59.42 0.1 positive manual P 192 18.1707 106 0.12 98
IV.SMA1.EHZ. 2021-10-06T04:18:59.98 0.6 undecidable manual S 125 7.4814 141 -0.02 51
IV.MTRA.HNZ. 2021-10-06T04:18:58.81 0.1 undecidable manual P 49 14.7741 114 0.01 100
IV.SMA1.EHZ. 2021-10-06T04:18:58.08 0.1 negative manual P 125 7.4814 141 0.17 98
IV.T1299.HNN. 2021-10-06T04:18:57.81 0.1 undecidable manual P 155 4.2957 157 0.16 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.5 0.00041600000000000003 0.1 AML other m 2021-10-06T04:19:00.50
IV.SMA1.EHN. ML:1.4 0.0003375 0.42 AML other m 2021-10-06T04:19:00.45
IV.MTRA.EHE. ML:1.8 0.0005585 0.82 AML other m 2021-10-06T04:19:01.28
IV.MTRA.HNN. ML:1.8 0.0005955 0.34 AML other m 2021-10-06T04:19:01.26
IV.MTRA.EHN. ML:1.8 0.000587 0.34 AML other m 2021-10-06T04:19:01.44
IV.MTRA.HNE. ML:1.8 0.0005620000000000001 0.52 AML other m 2021-10-06T04:19:01.60
IV.NRCA.HHN. ML:1.7 0.000347 0.14 AML other m 2021-10-06T04:19:03.10
IV.RM33.EHN. ML:1.4 0.0001715 1.52 AML other m 2021-10-06T04:19:03.15
IV.NRCA.HHE. ML:1.9 0.0005135 0.26 AML other m 2021-10-06T04:19:03.29
IV.RM33.EHE. ML:1.4 0.00021050000000000002 0.72 AML other m 2021-10-06T04:19:04.09
IV.FDMO.HHE. ML:1.1 0.000040050000000000004 0.36 AML other m 2021-10-06T04:19:09.80
IV.FDMO.HHN. ML:1.3 0.00006035 0.56 AML other m 2021-10-06T04:19:11.18
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