Earthquake with magnitude of ML 0.8 on date 21-08-2021 and time 05:12:04 (Italy) in region 6 km W Accumoli (RI)

A magnitude ML 0.8 earthquake occured in region: 6 km W Accumoli (RI), on

  • 21-08-2021 03:12:04 (UTC)
  • 21-08-2021 05:12:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7220, 13.1780 at 9 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.

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 7 667 667
Norcia PG 11 4957 5624
Arquata del Tronto AP 11 1178 6802
Cittareale RI 12 482 7284
Cascia PG 13 3217 10501
Amatrice RI 14 2657 13158
Montegallo AP 19 523 13681
Castelsantangelo sul Nera MC 19 281 13962
Acquasanta Terme AP 20 2916 16878
Poggiodomo PG 20 117 16995

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km W of Teramo (54892 inhabitants)
45 Km NW of L'Aquila (69753 inhabitants)
47 Km SE of Foligno (57155 inhabitants)
47 Km E of Terni (111501 inhabitants)
77 Km SE of Perugia (166134 inhabitants)
83 Km W of Montesilvano (53738 inhabitants)
88 Km NE of Guidonia Montecelio (88673 inhabitants)
90 Km W of Pescara (121014 inhabitants)
90 Km NE of Tivoli (56533 inhabitants)
91 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 0.8 2021-08-21
03:12:04
42.7225 13.1782 9 2021-08-21
03:16:12
Sala Sismica INGV-Roma 94450041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-21 03:12:04 ± 0.2
Latitude 42.7225 ± 0.0027
Longitude 13.1782 ± 0.0037
Depth (km) 9 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94450041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 320
Semi-minor axis of confidence ellipse (meter) 81
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 270
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 75
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.21494
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.1
Num. used stations 10
Type of magnitude ML
Reference to an origin 94450041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-21 03:16:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RNI2.HHZ. 2021-08-21T03:12:44.62 3.0 undecidable manual S 0 0
IV.RMP.HHZ. 2021-08-21T03:12:20.71 3.0 negative manual P -2.4 0
IV.RM33.EHZ. 2021-08-21T03:12:13.03 0.1 undecidable manual S 173 23.8539 111 -0.09 100
IV.MC2.EHZ. 2021-08-21T03:12:12.50 0.1 undecidable manual S 2 20.9679 114 0.31 96
IV.CSP1.EHZ. 2021-08-21T03:12:12.15 3.0 undecidable manual P 0.15 0
IV.MMO1.EHZ. 2021-08-21T03:12:12.62 0.3 undecidable manual S 32 23.0547 112 -0.24 73
IV.GAVE.EHZ. 2021-08-21T03:12:12.81 0.3 undecidable manual S 262 23.3544 112 -0.16 74
IV.TERO.HHZ. 2021-08-21T03:12:11.13 3.0 undecidable manual P -0.12 0
IV.SMA1.EHZ. 2021-08-21T03:12:11.01 0.3 undecidable manual S 128 16.3725 120 0.24 74
IV.MTRA.EHZ. 2021-08-21T03:12:11.10 0.3 undecidable manual S 78 18.1707 117 -0.22 74
IV.GAVE.EHZ. 2021-08-21T03:12:09.21 0.6 positive manual P 262 23.3544 112 -0.06 50
IV.RM33.EHZ. 2021-08-21T03:12:09.25 1.0 positive manual P 173 23.8539 111 -0.11 25
IV.NRCA.HHZ. 2021-08-21T03:12:09.80 0.3 undecidable manual S 337 13.3755 125 -0.09 76
IV.MC2.EHZ. 2021-08-21T03:12:09.03 1.0 undecidable manual P 2 20.9679 114 0.2 25
IV.MMO1.EHZ. 2021-08-21T03:12:09.09 0.6 negative manual P 32 23.0547 112 -0.12 50
IV.SMA1.EHZ. 2021-08-21T03:12:08.18 0.6 undecidable manual P 128 16.3725 120 0.17 50
IV.LNSS.HHE. 2021-08-21T03:12:08.35 0.3 undecidable manual P 220 17.3715 118 0.17 75
IV.MTRA.EHZ. 2021-08-21T03:12:08.29 0.3 undecidable manual P 78 18.1707 117 -0.04 77
IV.NRCA.HHZ. 2021-08-21T03:12:07.53 0.6 undecidable manual P 337 13.3755 125 0.04 51
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.0 0.0000986 1.28 AML other m 2021-08-21T03:12:09.89
IV.NRCA.HHE. ML:1.0 0.0001079 0.16 AML other m 2021-08-21T03:12:10.08
IV.SMA1.EHN. ML:0.6 0.0000402 1.12 AML other m 2021-08-21T03:12:11.95
IV.MTRA.EHN. ML:0.7 0.00004195 0.7 AML other m 2021-08-21T03:12:11.57
IV.SMA1.EHE. ML:0.9 0.00006575 0.8 AML other m 2021-08-21T03:12:11.99
IV.MTRA.EHE. ML:0.9 0.00006254999999999999 1 AML other m 2021-08-21T03:12:11.23
IV.GAVE.EHN. ML:0.8 0.00004 0.84 AML other m 2021-08-21T03:12:13.03
IV.GAVE.EHE. ML:0.7 0.00003195 0.92 AML other m 2021-08-21T03:12:13.75
IV.RM33.EHE. ML:0.8 0.00003795 0.9 AML other m 2021-08-21T03:12:13.35
IV.RM33.EHN. ML:0.6 0.0000257 0.98 AML other m 2021-08-21T03:12:13.16
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