Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 01-03-2021 and time 04:58:16 (UTC) in region 4 km E Accumoli (RI)

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

  • 01-03-2021 04:58:16 (UTC)
  • 01-03-2021 05:58:16 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7, 13.29 at 13 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 8 1178 1845
Amatrice RI 8 2657 4502
Acquasanta Terme AP 12 2916 7418
Cittareale RI 14 482 7900
Montegallo AP 16 523 8423
Campotosto AQ 17 542 8965
Valle Castellana TE 17 977 9942
Norcia PG 19 4957 14899
Rocca Santa Maria TE 19 537 15436
Cortino TE 20 656 16092

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km W of Teramo (54892 inhabitants)
40 Km N of L'Aquila (69753 inhabitants)
55 Km E of Terni (111501 inhabitants)
56 Km SE of Foligno (57155 inhabitants)
73 Km W of Montesilvano (53738 inhabitants)
80 Km W of Pescara (121014 inhabitants)
82 Km W of Chieti (51815 inhabitants)
86 Km SE of Perugia (166134 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
92 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 2021-03-01
04:58:16		 42.7 13.29 13 2021-03-02
00:02:20		 Sala Sismica INGV-Roma 87613091
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-01 04:58:16 ± 0.13
Latitude 42.70 ± 0.01
Longitude 13.29 ± 0.01
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87613091

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 850
Semi-minor axis of confidence ellipse (meter) 474
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 66
Circular confidence region, given by single value of horizontal uncertainty (meter) 850
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 129
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
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) 0.06835
Epicentral distance of station farthest from the epicenter (degree) 0.24282
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 87613091
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-02 00:02:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-03-01T04:58:26.15 0.3 undecidable manual S 109 0.2428 97 -0.27 70
IV.MMO1.EHZ. 2021-03-01T04:58:25.15 0.3 undecidable manual S 7 0.1979 100 0.04 75
IV.NRCA.HHZ. 2021-03-01T04:58:24.27 0.3 undecidable manual S 315 0.1844 102 -0.44 69
IV.MTRA.EHZ. 2021-03-01T04:58:22.09 0.3 undecidable manual S 55 0.0944 128 -0.17 73
IV.TERO.HHZ. 2021-03-01T04:58:22.43 0.1 undecidable manual P 109 0.2428 97 0.1 98
IV.T1299.EHN. 2021-03-01T04:58:21.67 0.3 undecidable manual S 186 0.0683 140 -0.05 77
IV.NRCA.HHZ. 2021-03-01T04:58:21.31 0.1 undecidable manual P 315 0.1844 102 -0.03 100
IV.SMA1.EHZ. 2021-03-01T04:58:21.47 0.3 undecidable manual S 156 0.0791 135 -0.45 70
IV.MMO1.EHZ. 2021-03-01T04:58:21.74 0.1 undecidable manual P 7 0.1979 100 0.17 98
IV.MTRA.EHZ. 2021-03-01T04:58:20.13 0.1 undecidable manual P 55 0.0944 128 0.2 99
IV.SMA1.EHZ. 2021-03-01T04:58:19.94 0.1 undecidable manual P 156 0.0791 135 0.2 98
IV.T1299.EHN. 2021-03-01T04:58:19.87 0.1 undecidable manual P 186 0.0683 140 0.25 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:0.8 6.53E-5 0.62 AML other m 2021-03-01T04:58:22.07
IV.SMA1.EHN. ML:0.9 9.175E-5 0.74 AML other m 2021-03-01T04:58:22.89
IV.MTRA.EHN. ML:0.7 4.84E-5 0.9 AML other m 2021-03-01T04:58:22.20
IV.MTRA.EHE. ML:0.8 6.07E-5 1.16 AML other m 2021-03-01T04:58:22.23
IV.NRCA.HHN. ML:0.9 5.365E-5 0.42 AML other m 2021-03-01T04:58:24.53
IV.NRCA.HHE. ML:1.1 7.915E-5 0.08 AML other m 2021-03-01T04:58:24.56
IV.NRCA.HNE. ML:1.1 8.4646455E-5 0.08 AML other m 2021-03-01T04:58:24.56
IV.TERO.HHE. ML:0.3 1.09798715E-5 0.08 AML other m 2021-03-01T04:58:26.66
IV.TERO.HHN. ML:0.6 1.7595595E-5 0.08 AML other m 2021-03-01T04:58:26.72
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download