Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 16-10-2020 and time 19:51:33 (Italy) in region 5 km N Accumoli (RI)

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

  • 16-10-2020 17:51:33 (UTC)
  • 16-10-2020 19:51:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7390, 13.2390 at 11 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
Accumoli RI 5 667 667
Arquata del Tronto AP 6 1178 1845
Amatrice RI 13 2657 4502
Norcia PG 13 4957 9459
Montegallo AP 14 523 9982
Acquasanta Terme AP 14 2916 12898
Cittareale RI 15 482 13380
Cascia PG 19 3217 16597
Castelsantangelo sul Nera MC 19 281 16878
Montemonaco AP 19 604 17482

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km W of Teramo (54892 inhabitants)
45 Km NW of L'Aquila (69753 inhabitants)
50 Km E of Foligno (57155 inhabitants)
52 Km E of Terni (111501 inhabitants)
79 Km W of Montesilvano (53738 inhabitants)
80 Km SE of Perugia (166134 inhabitants)
85 Km W of Pescara (121014 inhabitants)
88 Km NW of Chieti (51815 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
93 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
Reviewed
Rev100 		ML 0.9 2020-10-16
17:51:33		 42.7387 13.2387 11 2020-10-16
17:56:17		 Sala Sismica INGV-Roma 83824691
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-16 17:51:33 ± 0.06
Latitude 42.7387 ± 0.0036
Longitude 13.2387 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83824691

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 404
Semi-minor axis of confidence ellipse (meter) 343
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 85
Circular confidence region, given by single value of horizontal uncertainty (meter) 400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 59
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.10882
Epicentral distance of station farthest from the epicenter (degree) 0.29228
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 83824691
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-16 17:56:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2020-10-16T17:51:45.03 0.6 undecidable manual S 113 32.4453 50 0.09 48
IV.GAVE.EHZ. 2020-10-16T17:51:44.03 0.6 undecidable manual S 260 28.5492 50 0.13 48
IV.RM33.EHZ. 2020-10-16T17:51:43.36 0.6 undecidable manual S 184 25.5522 50 0.25 47
IV.LNSS.HHZ. 2020-10-16T17:51:42.19 0.6 undecidable manual S 227 22.0668 50 0.01 50
IV.MMO1.EHZ. 2020-10-16T17:51:41.27 0.6 undecidable manual S 22 19.1697 50 -0.14 49
IV.MC2.EHZ. 2020-10-16T17:51:41.69 0.6 undecidable manual S 348 19.5693 50 0.18 48
IV.TERO.HHZ. 2020-10-16T17:51:40.19 0.1 undecidable manual P 113 32.4453 50 -0.05 97
IV.SMA1.EHZ. 2020-10-16T17:51:40.08 0.6 undecidable manual S 147 14.3745 128 -0.04 50
IV.GAVE.EHZ. 2020-10-16T17:51:39.55 0.1 undecidable manual P 260 28.5492 50 -0.09 96
IV.NRCA.HHZ. 2020-10-16T17:51:39.87 0.6 undecidable manual S 316 14.5743 50 -0.31 47
IV.T1299.HNZ. 2020-10-16T17:51:39.75 0.6 undecidable manual S 163 12.0768 132 0.23 48
IV.MTRA.HNZ. 2020-10-16T17:51:39.28 0.6 undecidable manual S 81 12.9759 130 -0.47 46
IV.MC2.EHZ. 2020-10-16T17:51:38.34 0.1 undecidable manual P 348 19.5693 50 0.08 98
IV.MMO1.EHZ. 2020-10-16T17:51:38.34 0.1 undecidable manual P 22 19.1697 50 0.13 97
IV.LNSS.HHZ. 2020-10-16T17:51:38.61 0.1 undecidable manual P 227 22.0668 50 -0.04 98
IV.RM33.EHZ. 2020-10-16T17:51:38.64 0.1 undecidable manual P 184 25.5522 50 -0.54 87
IV.NRCA.HHZ. 2020-10-16T17:51:37.63 0.1 undecidable manual P 316 14.5743 50 0.13 98
IV.T1299.HNZ. 2020-10-16T17:51:37.06 0.1 undecidable manual P 163 12.0768 132 -0.05 100
IV.SMA1.EHZ. 2020-10-16T17:51:37.77 0.1 undecidable manual P 147 14.3745 128 0.31 94
IV.MTRA.HNZ. 2020-10-16T17:51:37.33 0.1 undecidable manual P 81 12.9759 130 0.08 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.2 0.00015455565 0.1792 AML other m 2020-10-16T17:51:40.15
IV.NRCA.HHN. ML:1.2 0.00015086615 0.1664 AML other m 2020-10-16T17:51:40.06
IV.NRCA.HNE. ML:1.2 0.00013995695 0.1024 AML other m 2020-10-16T17:51:40.40
IV.NRCA.HNN. ML:1.2 0.000156706 0.0896 AML other m 2020-10-16T17:51:40.02
IV.SMA1.EHE. ML:0.4 0.000023002555000000003 0.1664 AML other m 2020-10-16T17:51:40.86
IV.SMA1.EHN. ML:0.6 0.000033800474999999994 0.832 AML other m 2020-10-16T17:51:40.15
IV.LNSS.HNE. ML:1.0 0.00007011324500000001 0.2944 AML other m 2020-10-16T17:51:42.38
IV.LNSS.HNN. ML:1.0 0.000070401225 0.8576 AML other m 2020-10-16T17:51:42.19
IV.LNSS.HHE. ML:0.7 0.000027810765000000002 0.0896 AML other m 2020-10-16T17:51:43.60
IV.LNSS.HHN. ML:0.7 0.0000361130232 0.128 AML other m 2020-10-16T17:51:42.55
IV.GAVE.HNE. ML:1.3 0.000101709415 1.1648 AML other m 2020-10-16T17:51:44.11
IV.GAVE.HNN. ML:1.0 0.000055563520000000006 0.9472 AML other m 2020-10-16T17:51:43.92
IV.GAVE.EHE. ML:0.7 0.00002396189 0.1408 AML other m 2020-10-16T17:51:45.44
IV.GAVE.EHN. ML:0.6 0.000021529328 0.1408 AML other m 2020-10-16T17:51:45.59
IV.TERO.HHE. ML:0.7 0.000021270365 0.1024 AML other m 2020-10-16T17:51:45.70
IV.TERO.HHN. ML:0.7 0.000021820824999999998 0.4608 AML other m 2020-10-16T17:51:45.38
IV.TERO.HNE. ML:0.8 0.000029886505 0.8576 AML other m 2020-10-16T17:51:44.88
IV.TERO.HNN. ML:1.3 0.00007815045500000001 0.2304 AML other m 2020-10-16T17:51:45.17
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