Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 20-08-2020 and time 01:12:26 (UTC) in region 9 km W Accumoli (RI)

A magnitude ML 1.1 earthquake occured in region: 9 km W Accumoli (RI), on

  • 20-08-2020 01:12:26 (UTC)
  • 20-08-2020 03:12:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7060, 13.1430 at 10 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 9 667 667
Cittareale RI 10 482 1149
Norcia PG 10 4957 6106
Cascia PG 11 3217 9323
Arquata del Tronto AP 15 1178 10501
Amatrice RI 15 2657 13158
Monteleone di Spoleto PG 17 599 13757
Poggiodomo PG 17 117 13874

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km E of Terni (111501 inhabitants)
45 Km NW of L'Aquila (69753 inhabitants)
45 Km SE of Foligno (57155 inhabitants)
46 Km W of Teramo (54892 inhabitants)
76 Km SE of Perugia (166134 inhabitants)
85 Km W of Montesilvano (53738 inhabitants)
86 Km NE of Guidonia Montecelio (88673 inhabitants)
87 Km NE of Tivoli (56533 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
92 Km W of Pescara (121014 inhabitants)
93 Km W of Chieti (51815 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 1.1 2020-08-20
01:12:26		 42.7065 13.1427 10 2020-08-20
01:17:28		 Sala Sismica INGV-Roma 82163901
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-20 01:12:26 ± 0.07
Latitude 42.7065 ± 0.0045
Longitude 13.1427 ± 0.0061
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 82163901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 490
Semi-minor axis of confidence ellipse (meter) 452
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 114
Circular confidence region, given by single value of horizontal uncertainty (meter) 490.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 65
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) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.12770
Epicentral distance of station farthest from the epicenter (degree) 0.48833
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 82163901
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-20 01:17:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2020-08-20T01:12:44.39 0.6 undecidable manual S 314 54.2013 50 0.57 41
IV.GUMA.HHZ. 2020-08-20T01:12:41.63 0.6 undecidable manual S 22 42.5241 50 0.94 36
IV.MF5.EHZ. 2020-08-20T01:12:41.10 0.6 undecidable manual S 39 40.4262 50 0.95 36
IV.CSP1.EHZ. 2020-08-20T01:12:40.76 0.6 undecidable manual S 7 43.0236 50 -0.08 47
IV.TERO.HHZ. 2020-08-20T01:12:39.19 0.6 undecidable manual S 104 38.7279 50 -0.5 44
IV.FDMO.HHZ. 2020-08-20T01:12:38.90 0.6 undecidable manual S 353 36.8298 50 -0.29 46
IV.ARRO.EHZ. 2020-08-20T01:12:38.02 0.6 undecidable manual S 245 33.8439 50 -0.37 45
IV.ASSB.HHZ. 2020-08-20T01:12:36.73 0.3 undecidable manual P 314 54.2013 50 0.13 69
IV.RM33.EHZ. 2020-08-20T01:12:35.32 0.6 undecidable manual S 165 22.6551 115 -0.07 49
IV.MMO1.EHZ. 2020-08-20T01:12:35.93 0.6 undecidable manual S 35 26.1516 50 -0.39 46
IV.CSP1.EHZ. 2020-08-20T01:12:34.69 1.0 positive manual P 7 43.0236 50 -0.19 23
IV.GAVE.EHZ. 2020-08-20T01:12:34.51 0.6 undecidable manual S 266 20.3685 117 -0.15 49
IV.MF5.EHZ. 2020-08-20T01:12:34.79 1.0 undecidable manual P 39 40.4262 50 0.31 23
IV.GUMA.HHZ. 2020-08-20T01:12:34.96 1.0 positive manual P 22 42.5241 50 0.17 23
IV.TERO.HHZ. 2020-08-20T01:12:34.02 0.3 undecidable manual P 104 38.7279 50 -0.2 70
IV.SMA1.EHZ. 2020-08-20T01:12:34.13 0.6 undecidable manual S 118 17.871 120 0.23 48
IV.ARRO.EHZ. 2020-08-20T01:12:33.52 1.0 negative manual P 245 33.8439 50 0.06 24
IV.FDMO.HHZ. 2020-08-20T01:12:33.67 1.0 undecidable manual P 353 36.8298 50 -0.26 23
IV.LNSS.HHZ. 2020-08-20T01:12:33.04 0.6 undecidable manual S 216 14.1747 126 0.2 49
IV.MMO1.EHZ. 2020-08-20T01:12:32.00 0.1 negative manual P 35 26.1516 50 -0.27 94
IV.NRCA.HHZ. 2020-08-20T01:12:32.44 0.6 undecidable manual S 351 14.2746 126 -0.43 46
IV.SMA1.EHZ. 2020-08-20T01:12:31.07 0.6 negative manual P 118 17.871 120 0.2 48
IV.GAVE.EHZ. 2020-08-20T01:12:31.29 0.1 positive manual P 266 20.3685 117 -0.02 100
IV.RM33.EHZ. 2020-08-20T01:12:31.66 1.0 undecidable manual P 165 22.6551 115 -0.07 25
IV.LNSS.HHZ. 2020-08-20T01:12:30.49 0.1 positive manual P 216 14.1747 126 0.23 97
IV.NRCA.HHZ. 2020-08-20T01:12:30.19 0.1 negative manual P 351 14.2746 126 -0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.5 0.00030700000000000004 0.14 AML other m 2020-08-20T01:12:32.94
IV.NRCA.HHN. ML:1.3 0.0001965 0.14 AML other m 2020-08-20T01:12:32.89
IV.LNSS.HHE. ML:1.6 0.0004275 0.72 AML other m 2020-08-20T01:12:33.16
IV.LNSS.HHN. ML:1.6 0.0003445 0.14 AML other m 2020-08-20T01:12:33.66
IV.SMA1.EHN. ML:1.0 0.0000915 0.2 AML other m 2020-08-20T01:12:34.36
IV.SMA1.EHE. ML:1.1 0.00009795 0.18 AML other m 2020-08-20T01:12:34.59
IV.GAVE.EHN. ML:1.4 0.000158 1.86 AML other m 2020-08-20T01:12:35.94
IV.GAVE.EHE. ML:1.5 0.00022499999999999997 1.84 AML other m 2020-08-20T01:12:35.96
IV.RM33.EHN. ML:0.8 0.00004695 0.08 AML other m 2020-08-20T01:12:35.57
IV.RM33.EHE. ML:0.7 0.00003395 1.78 AML other m 2020-08-20T01:12:37.91
IV.FDMO.HHN. ML:0.6 0.00001645 0.24 AML other m 2020-08-20T01:12:39.64
IV.TERO.HHN. ML:0.9 0.000030050000000000002 0.7 AML other m 2020-08-20T01:12:39.61
IV.ARRO.EHE. ML:0.8 0.0000251 0.22 AML other m 2020-08-20T01:12:40.84
IV.FDMO.HHE. ML:0.6 0.000016250000000000002 0.68 AML other m 2020-08-20T01:12:40.52
IV.ARRO.EHN. ML:0.7 0.00002175 1.8 AML other m 2020-08-20T01:12:41.90
IV.TERO.HHE. ML:0.9 0.000031700000000000005 0.82 AML other m 2020-08-20T01:12:41.03
IV.GUMA.HHE. ML:1.2 0.000056099999999999995 0.9 AML other m 2020-08-20T01:12:41.96
IV.GUMA.HHN. ML:1.4 0.000074 0.66 AML other m 2020-08-20T01:12:42.48
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