Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 21-09-2020 and time 07:30:21 (UTC) in region 4 km NE Accumoli (RI)

A magnitude ML 0.8 earthquake occured in region: 4 km NE Accumoli (RI), on

  • 21-09-2020 07:30:21 (UTC)
  • 21-09-2020 09:30:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7280, 13.2630 at 14 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 4 667 667
Arquata del Tronto AP 6 1178 1845
Amatrice RI 11 2657 4502
Acquasanta Terme AP 13 2916 7418
Montegallo AP 14 523 7941
Cittareale RI 15 482 8423
Norcia PG 16 4957 13380
Valle Castellana TE 19 977 14357
Montemonaco AP 20 604 14961

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km W of Teramo (54892 inhabitants)
43 Km N of L'Aquila (69753 inhabitants)
52 Km E of Foligno (57155 inhabitants)
54 Km E of Terni (111501 inhabitants)
76 Km W of Montesilvano (53738 inhabitants)
83 Km SE of Perugia (166134 inhabitants)
83 Km W of Pescara (121014 inhabitants)
85 Km NW of Chieti (51815 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
93 Km NE of Tivoli (56533 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 0.8 2020-09-21
07:30:21		 42.7277 13.2632 14 2020-09-21
07:36:57		 Sala Sismica INGV-Roma 83093481
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-21 07:30:21 ± 0.08
Latitude 42.7277 ± 0.0027
Longitude 13.2632 ± 0.0049
Depth (km) 14 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83093481

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 310
Semi-minor axis of confidence ellipse (meter) 223
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 251
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) 81
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.27160
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 9
Type of magnitude ML
Reference to an origin 83093481
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-21 07:36:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MURB.HHZ. 2020-09-21T07:30:44.97 3.0 undecidable manual S -0.02 0
IV.TERO.HHZ. 2020-09-21T07:30:31.77 0.1 undecidable manual S 113 30.1476 99 -0.21 93
IV.RM33.EHZ. 2020-09-21T07:30:30.59 0.1 undecidable manual S 189 24.5532 102 0.07 99
IV.LNSS.HHN. 2020-09-21T07:30:30.11 0.1 undecidable manual S 233 22.8549 104 0.04 99
IV.MMO1.EHZ. 2020-09-21T07:30:29.31 0.1 undecidable manual S 15 19.7691 108 0.04 99
IV.NRCA.HHZ. 2020-09-21T07:30:28.25 0.1 undecidable manual S 314 16.872 114 -0.31 92
IV.MTRA.EHZ. 2020-09-21T07:30:27.30 0.1 undecidable manual S 73 11.2776 129 0.01 100
IV.TERO.HHZ. 2020-09-21T07:30:27.56 0.6 undecidable manual P 113 30.1476 99 0.04 49
IV.SMA1.EHZ. 2020-09-21T07:30:27.38 0.3 undecidable manual S 151 12.2766 126 -0.11 73
IV.MMO1.EHZ. 2020-09-21T07:30:26.02 0.3 undecidable manual P 15 19.7691 108 0.06 75
IV.RM33.EHZ. 2020-09-21T07:30:26.93 0.6 undecidable manual P 189 24.5532 102 0.25 48
IV.LNSS.HHN. 2020-09-21T07:30:26.39 0.1 undecidable manual P 233 22.8549 104 -0.03 97
IV.MC2.EHZ. 2020-09-21T07:30:26.39 1.0 positive manual P 344 21.2676 106 0.21 24
IV.NRCA.HHZ. 2020-09-21T07:30:25.54 0.1 negative manual P 314 16.872 114 -0.01 99
IV.MTRA.EHZ. 2020-09-21T07:30:25.07 0.3 undecidable manual P 73 11.2776 129 0.26 74
IV.SMA1.EHZ. 2020-09-21T07:30:24.96 1.0 undecidable manual P 151 12.2766 126 0.03 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:0.8 0.000052688895 0.1024 AML other m 2020-09-21T07:30:27.71
IV.SMA1.EHN. ML:0.8 0.000056755584999999995 0.1792 AML other m 2020-09-21T07:30:27.53
IV.NRCA.HNE. ML:1.3 0.00015623128 0.1408 AML other m 2020-09-21T07:30:28.40
IV.NRCA.HHE. ML:1.3 0.00015324529999999998 0.16 AML other m 2020-09-21T07:30:28.47
IV.NRCA.HHN. ML:1.0 0.0000829207 0.1024 AML other m 2020-09-21T07:30:28.40
IV.RM33.EHE. ML:0.6 0.00001843815 0.16 AML other m 2020-09-21T07:30:31.13
IV.RM33.EHN. ML:0.6 0.00002598407 0.2752 AML other m 2020-09-21T07:30:30.73
IV.TERO.HHE. ML:0.5 0.000013284975 0.064 AML other m 2020-09-21T07:30:32.04
IV.TERO.HHN. ML:0.3 0.0000108113505 0.0576 AML other m 2020-09-21T07:30:32.08
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