Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.5 on date 21-09-2020 and time 00:49:45 (Italy) in region 5 km W Accumoli (RI)

A magnitude ML 0.5 earthquake occured in region: 5 km W Accumoli (RI), on

  • 20-09-2020 22:49:45 (UTC)
  • 21-09-2020 00:49:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6900, 13.1880 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
Cittareale RI 8 482 1149
Amatrice RI 11 2657 3806
Arquata del Tronto AP 13 1178 4984
Norcia PG 14 4957 9941
Cascia PG 15 3217 13158
Montereale AQ 19 2581 15739
Monteleone di Spoleto PG 20 599 16338
Posta RI 20 694 17032

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km NW of L'Aquila (69753 inhabitants)
42 Km W of Teramo (54892 inhabitants)
46 Km E of Terni (111501 inhabitants)
49 Km SE of Foligno (57155 inhabitants)
80 Km SE of Perugia (166134 inhabitants)
81 Km W of Montesilvano (53738 inhabitants)
85 Km NE of Guidonia Montecelio (88673 inhabitants)
87 Km NE of Tivoli (56533 inhabitants)
88 Km W of Pescara (121014 inhabitants)
89 Km W of Chieti (51815 inhabitants)
94 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 0.5 2020-09-20
22:49:45		 42.6897 13.1878 11 2020-09-20
22:53:45		 Sala Sismica INGV-Roma 83082211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-20 22:49:45 ± 0.06
Latitude 42.6897 ± 0.0036
Longitude 13.1878 ± 0.0049
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83082211

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 480
Semi-minor axis of confidence ellipse (meter) 360
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 327
Circular confidence region, given by single value of horizontal uncertainty (meter) 480.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
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) 0.08903
Epicentral distance of station farthest from the epicenter (degree) 0.31296
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 83082211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-20 22:53:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2020-09-20T22:49:56.85 0.3 undecidable manual S 102 34.743 90 -0.52 65
IV.MMO1.EHZ. 2020-09-20T22:49:55.27 0.3 undecidable manual S 26 25.8519 90 0.27 70
IV.GAVE.EHZ. 2020-09-20T22:49:54.54 0.3 undecidable manual S 271 23.9538 90 0.05 74
IV.NRCA.HHZ. 2020-09-20T22:49:52.53 0.3 undecidable manual S 339 17.0718 90 -0.12 73
IV.TERO.HHZ. 2020-09-20T22:49:52.23 0.6 undecidable manual P 102 34.743 90 -0.19 47
IV.LNSS.HHE. 2020-09-20T22:49:52.23 0.3 undecidable manual S 231 15.3735 90 0.02 75
IV.MTRA.HNE. 2020-09-20T22:49:52.71 0.3 undecidable manual S 66 18.5703 90 -0.34 70
IV.SMA1.EHZ. 2020-09-20T22:49:51.76 0.3 undecidable manual S 119 13.6752 92 0 75
IV.MMO1.EHZ. 2020-09-20T22:49:51.23 0.1 undecidable manual P 26 25.8519 90 0.18 96
IV.T1299.HNZ. 2020-09-20T22:49:50.70 0.1 undecidable manual S 129 9.879 120 -0.08 100
IV.GAVE.EHZ. 2020-09-20T22:49:50.77 0.3 undecidable manual P 271 23.9538 90 0.02 74
IV.SMA1.EHZ. 2020-09-20T22:49:49.33 0.3 undecidable manual P 119 13.6752 92 0.16 73
IV.NRCA.HHZ. 2020-09-20T22:49:49.86 0.3 undecidable manual P 339 17.0718 90 0.17 73
IV.LNSS.HHE. 2020-09-20T22:49:49.49 0.3 undecidable manual P 231 15.3735 90 0.06 75
IV.MTRA.HNE. 2020-09-20T22:49:49.87 0.3 undecidable manual P 66 18.5703 90 -0.05 74
IV.T1299.HNZ. 2020-09-20T22:49:48.91 0.3 undecidable manual P 129 9.879 120 0.29 72
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:0.3 0.00002165 0.82 AML other m 2020-09-20T22:49:51.28
IV.SMA1.EHE. ML:0.4 0.0000256 0.16 AML other m 2020-09-20T22:49:52.23
IV.NRCA.HHE. ML:0.6 0.0000351 0.32 AML other m 2020-09-20T22:49:52.88
IV.NRCA.HHN. ML:0.6 0.00003695 0.1 AML other m 2020-09-20T22:49:53.24
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