Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 02-09-2021 and time 05:26:15 (UTC) in region 1 km SW Accumoli (RI)

A magnitude ML 1.3 earthquake occured in region: 1 km SW Accumoli (RI), on

  • 02-09-2021 05:26:15 (UTC)
  • 02-09-2021 07:26:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6890, 13.2410 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 1 667 667
Amatrice RI 8 2657 3324
Cittareale RI 10 482 3806
Arquata del Tronto AP 11 1178 4984
Acquasanta Terme AP 17 2916 7900
Norcia PG 17 4957 12857
Campotosto AQ 18 542 13399
Montereale AQ 18 2581 15980
Montegallo AP 19 523 16503
Cascia PG 19 3217 19720
Capitignano AQ 19 665 20385

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km W of Teramo (54892 inhabitants)
40 Km NW of L'Aquila (69753 inhabitants)
51 Km E of Terni (111501 inhabitants)
53 Km SE of Foligno (57155 inhabitants)
77 Km W of Montesilvano (53738 inhabitants)
84 Km W of Pescara (121014 inhabitants)
84 Km SE of Perugia (166134 inhabitants)
85 Km W of Chieti (51815 inhabitants)
87 Km NE of Guidonia Montecelio (88673 inhabitants)
88 Km NE of Tivoli (56533 inhabitants)
98 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 1.3 2021-09-02
05:26:15		 42.6887 13.2413 11 2021-09-02
05:32:21		 Sala Sismica INGV-Roma 94943961
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-02 05:26:15 ± 0.08
Latitude 42.6887 ± 0.0045
Longitude 13.2413 ± 0.0061
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94943961

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 470
Semi-minor axis of confidence ellipse (meter) 282
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 108
Circular confidence region, given by single value of horizontal uncertainty (meter) 470.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 87
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 13
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.33904
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 94943961
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-02 05:32:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.APEC.HHZ. 2021-09-02T05:26:47.91 3.0 undecidable manual S -0.58 0
IT.RMMM.HGZ. 2021-09-02T05:26:32.08 3.0 undecidable manual P 0.22 0
IV.LNSS.HHZ. 2021-09-02T05:26:22.66 0.6 undecidable manual S 240 18.9699 119 0 50
IV.MF5.EHZ. 2021-09-02T05:26:22.86 0.6 negative manual P 28 37.629 50 0.44 44
IV.RM33.EHZ. 2021-09-02T05:26:22.81 0.6 undecidable manual S 186 20.0688 118 -0.18 48
IV.NRCA.HHZ. 2021-09-02T05:26:22.49 0.6 undecidable manual S 327 19.1697 119 -0.22 48
IV.MTRA.EHZ. 2021-09-02T05:26:21.21 0.6 undecidable manual S 59 14.7741 126 -0.2 48
IV.TERO.HHZ. 2021-09-02T05:26:21.00 0.3 positive manual P 104 30.4473 50 -0.32 69
IV.SMA1.EHZ. 2021-09-02T05:26:20.10 0.6 undecidable manual S 130 9.9789 136 -0.08 50
IV.MMO1.EHZ. 2021-09-02T05:26:20.33 0.3 undecidable manual P 17 24.3534 50 -0.05 74
IV.NRCA.HHZ. 2021-09-02T05:26:19.52 0.1 negative manual P 327 19.1697 119 0.01 100
IV.LNSS.HHZ. 2021-09-02T05:26:19.55 0.6 undecidable manual P 240 18.9699 119 0.07 49
IV.RM33.EHZ. 2021-09-02T05:26:19.67 1.0 undecidable manual P 186 20.0688 118 0 25
IV.SMA1.EHZ. 2021-09-02T05:26:18.33 0.1 positive manual P 130 9.9789 136 0.29 96
IV.MTRA.EHZ. 2021-09-02T05:26:18.83 0.1 positive manual P 59 14.7741 126 0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.0 0.00014000000000000001 0.32 AML other m 2021-09-02T05:26:20.74
IV.SMA1.EHN. ML:0.9 0.00010600000000000002 0.46 AML other m 2021-09-02T05:26:20.99
IV.NRCA.HHN. ML:1.6 0.000288 0.08 AML other m 2021-09-02T05:26:22.68
IV.NRCA.HHE. ML:1.8 0.0005110000000000001 0.12 AML other m 2021-09-02T05:26:22.81
IV.LNSS.HHE. ML:1.2 0.000129 1.68 AML other m 2021-09-02T05:26:23.94
IV.LNSS.HHN. ML:1.2 0.0001078 0.6 AML other m 2021-09-02T05:26:23.16
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