Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 26-08-2021 and time 03:15:13 (Italy) in region 6 km N Cittareale (RI)

A magnitude ML 1.0 earthquake occured in region: 6 km N Cittareale (RI), on

  • 26-08-2021 01:15:13 (UTC)
  • 26-08-2021 03:15:13 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6750, 13.1420 at 12 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
Cittareale RI 6 482 482
Accumoli RI 9 667 1149
Cascia PG 12 3217 4366
Amatrice RI 13 2657 7023
Norcia PG 14 4957 11980
Monteleone di Spoleto PG 16 599 12579
Arquata del Tronto AP 17 1178 13757
Posta RI 17 694 14451
Poggiodomo PG 17 117 14568
Borbona RI 18 617 15185
Montereale AQ 19 2581 17766
Leonessa RI 19 2435 20201

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km NW of L'Aquila (69753 inhabitants)
42 Km E of Terni (111501 inhabitants)
46 Km W of Teramo (54892 inhabitants)
48 Km SE of Foligno (57155 inhabitants)
78 Km SE of Perugia (166134 inhabitants)
82 Km NE of Guidonia Montecelio (88673 inhabitants)
84 Km NE of Tivoli (56533 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
90 Km E of Viterbo (67173 inhabitants)
91 Km W of Pescara (121014 inhabitants)
91 Km W of Chieti (51815 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 1.0 2021-08-26
01:15:13		 42.6747 13.1425 12 2021-08-26
01:31:52		 Sala Sismica INGV-Roma 94640811
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-26 01:15:13 ± 0.05
Latitude 42.6747 ± 0.0027
Longitude 13.1425 ± 0.0049
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94640811

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 328
Semi-minor axis of confidence ellipse (meter) 300
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 131
Circular confidence region, given by single value of horizontal uncertainty (meter) 330.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 77
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) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.10432
Epicentral distance of station farthest from the epicenter (degree) 0.36423
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:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 94640811
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-26 01:31:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2021-08-26T01:15:27.15 0.3 undecidable manual S 354 40.4262 92 0.23 70
IV.TERO.HHZ. 2021-08-26T01:15:26.33 0.3 undecidable manual S 99 38.0286 92 0.03 72
IV.GAVE.EHZ. 2021-08-26T01:15:21.42 0.3 undecidable manual S 276 20.3685 97 -0.16 72
IV.FDMO.HHZ. 2021-08-26T01:15:21.39 0.1 undecidable manual P 354 40.4262 92 0.07 96
IV.MTRA.EHZ. 2021-08-26T01:15:21.88 0.3 undecidable manual S 66 22.6551 95 -0.3 71
IV.RM33.EHZ. 2021-08-26T01:15:21.06 0.3 undecidable manual S 162 19.2696 98 -0.24 73
IV.SMA1.EHZ. 2021-08-26T01:15:20.69 0.3 undecidable manual S 107 16.4724 103 0.13 73
IV.NRCA.HHZ. 2021-08-26T01:15:20.67 0.3 undecidable manual S 353 17.7711 100 -0.23 71
IV.TERO.HHZ. 2021-08-26T01:15:20.85 0.1 undecidable manual P 99 38.0286 92 -0.12 95
IV.LNSS.HHZ. 2021-08-26T01:15:19.18 0.3 undecidable manual S 226 11.5773 120 -0.15 75
IV.RM33.EHZ. 2021-08-26T01:15:18.10 0.1 undecidable manual P 162 19.2696 98 0.02 100
IV.GAVE.EHZ. 2021-08-26T01:15:18.31 0.1 undecidable manual P 276 20.3685 97 0.07 100
IV.MTRA.EHZ. 2021-08-26T01:15:18.58 0.1 undecidable manual P 66 22.6551 95 -0.01 100
IV.LNSS.HHZ. 2021-08-26T01:15:17.09 0.1 undecidable manual P 226 11.5773 120 0.15 99
IV.SMA1.EHZ. 2021-08-26T01:15:17.87 0.1 undecidable manual P 107 16.4724 103 0.22 97
IV.NRCA.HHZ. 2021-08-26T01:15:17.93 0.1 undecidable manual P 353 17.7711 100 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHN. ML:1.3 0.00019800000000000002 0.18 AML other m 2021-08-26T01:15:19.46
IV.LNSS.HHE. ML:1.3 0.000226 0.7 AML other m 2021-08-26T01:15:19.53
IV.SMA1.EHE. ML:1.4 0.0001985 0.28 AML other m 2021-08-26T01:15:21.16
IV.SMA1.EHN. ML:1.2 0.0001244 0.3 AML other m 2021-08-26T01:15:21.24
IV.NRCA.HHE. ML:1.2 0.0001105 1.06 AML other m 2021-08-26T01:15:21.37
IV.RM33.EHN. ML:0.9 0.00005764999999999999 0.28 AML other m 2021-08-26T01:15:21.29
IV.NRCA.HHN. ML:1.1 0.00009510000000000001 0.1 AML other m 2021-08-26T01:15:21.44
IV.RM33.EHE. ML:0.6 0.000028749999999999997 0.56 AML other m 2021-08-26T01:15:21.18
IV.GAVE.EHE. ML:0.9 0.00005085000000000001 1.3 AML other m 2021-08-26T01:15:22.72
IV.MTRA.EHN. ML:0.6 0.000027099999999999998 1.06 AML other m 2021-08-26T01:15:22.25
IV.MTRA.EHE. ML:0.8 0.0000406 1.08 AML other m 2021-08-26T01:15:22.37
IV.GAVE.EHN. ML:0.8 0.00003895 0.4 AML other m 2021-08-26T01:15:24.04
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