Earthquake with magnitude of ML 0.8 on date 26-10-2021 and time 20:25:38 (UTC) in region 6 km SW Accumoli (RI)

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

  • 26-10-2021 20:25:38 (UTC)
  • 26-10-2021 22:25:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.664, 13.196 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.

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 6 667 667
Cittareale RI 6 482 1149
Amatrice RI 9 2657 3806
Arquata del Tronto AP 15 1178 4984
Montereale AQ 16 2581 7565
Cascia PG 16 3217 10782
Norcia PG 17 4957 15739
Posta RI 18 694 16433
Borbona RI 18 617 17050
Capitignano AQ 18 665 17715
Campotosto AQ 19 542 18257

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km NW of L'Aquila (69753 inhabitants)
42 Km W of Teramo (54892 inhabitants)
46 Km E of Terni (111501 inhabitants)
52 Km SE of Foligno (57155 inhabitants)
80 Km W of Montesilvano (53738 inhabitants)
82 Km SE of Perugia (166134 inhabitants)
83 Km NE of Guidonia Montecelio (88673 inhabitants)
84 Km NE of Tivoli (56533 inhabitants)
86 Km W of Pescara (121014 inhabitants)
87 Km W of Chieti (51815 inhabitants)
93 Km E of Viterbo (67173 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.8 2021-10-26
20:25:38
42.6643 13.1963 14 2021-10-26
20:33:39
Sala Sismica INGV-Roma 97009041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-26 20:25:38 ± 0.11
Latitude 42.6643 ± 0.0027
Longitude 13.1963 ± 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 97009041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 355
Semi-minor axis of confidence ellipse (meter) 200
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 258
Circular confidence region, given by single value of horizontal uncertainty (meter) 350
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 14
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
Epicentral distance of station farthest from the epicenter (degree) 0.30217
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 97009041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-26 20:33:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
AC.KBN.HHZ. 2021-10-26T20:27:07.35 3.0 undecidable manual Pn 4.74 0
IV.MNTV.EHZ. 2021-10-26T20:26:49.98 3.0 undecidable manual Sn -7.88 0
IX.SCL3.EHZ.02 2021-10-26T20:26:46.41 3.0 undecidable manual Sn 1.7 0
IX.SRN3.HHZ.02 2021-10-26T20:26:45.95 3.0 undecidable manual Sn -1.78 0
IV.GIZZ.HHZ. 2021-10-26T20:26:38.56 3.0 positive manual Pn 1.45 0
IV.MTMR.EHZ. 2021-10-26T20:26:34.04 3.0 undecidable manual Sn -0.18 0
IV.MILN.HNZ. 2021-10-26T20:26:32.15 3.0 undecidable manual Pn -2.3 0
IV.ZEN8.EHZ. 2021-10-26T20:26:28.32 3.0 undecidable manual Pn 0.75 0
IV.MSSA.HHZ. 2021-10-26T20:26:26.01 3.0 undecidable manual Pg 4.11 0
IV.PAOL.HHZ. 2021-10-26T20:26:11.21 3.0 undecidable manual Pg 7.11 0
IV.CSNT.HHZ. 2021-10-26T20:25:59.68 3.0 undecidable manual Pg -1.16 0
IV.TERO.HHZ. 2021-10-26T20:25:50.01 0.3 undecidable manual S 98 0.3022 97 -0.24 70
IV.MMO1.EHZ. 2021-10-26T20:25:48.96 0.6 undecidable manual S 22 0.2536 100 0.15 48
IV.RMP.HHZ. 2021-10-26T20:25:48.17 3.0 positive manual P -0.39 0
IV.NRCA.HHZ. 2021-10-26T20:25:46.36 0.3 undecidable manual S 340 0.1799 108 -0.32 71
IV.LNSS.HHZ. 2021-10-26T20:25:45.20 0.3 undecidable manual S 242 0.1304 120 -0.14 75
IV.RM33.EHZ. 2021-10-26T20:25:45.92 0.3 undecidable manual S 175 0.1556 113 -0.11 74
IV.TERO.HHZ. 2021-10-26T20:25:45.37 0.1 undecidable manual P 98 0.3022 97 -0.04 97
IV.SMA1.EHE. 2021-10-26T20:25:44.86 0.3 undecidable manual S 108 0.1079 128 0.07 75
IV.MMO1.EHZ. 2021-10-26T20:25:44.72 0.1 undecidable manual P 22 0.2536 100 0.14 96
IV.T1299.HNE. 2021-10-26T20:25:43.91 0.3 undecidable manual S 116 0.0701 143 -0.1 76
IV.NRCA.HHZ. 2021-10-26T20:25:43.36 0.1 undecidable manual P 340 0.1799 108 0.02 100
IV.RM33.EHZ. 2021-10-26T20:25:43.07 0.1 undecidable manual P 175 0.1556 113 0.1 99
IV.LNSS.HHZ. 2021-10-26T20:25:42.63 0.1 undecidable manual P 242 0.1304 120 0.06 100
IV.SMA1.EHE. 2021-10-26T20:25:42.43 0.3 undecidable manual P 108 0.1079 128 0.18 74
IV.T1299.HNE. 2021-10-26T20:25:41.92 0.3 undecidable manual P 116 0.0701 143 0.12 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHN. ML:0.9 6.5E-5 0.18 AML other m 2021-10-26T20:25:45.43
IV.LNSS.HHE. ML:0.8 6.085E-5 0.3 AML other m 2021-10-26T20:25:45.46
IV.NRCA.HHN. ML:0.6 2.8776995E-5 2.3424 AML other m 2021-10-26T20:25:46.96
IV.NRCA.HHE. ML:0.9 5.475E-5 0.68 AML other m 2021-10-26T20:25:46.61
IX.SCL3.EHN.02 ML:3 0.0001365 0.06 AML other m 2021-10-26T20:27:10.63
IV.RM33.EHN. ML:0.6 3.1364415E-5 0.9216 AML other m 2021-10-26T20:25:46.12
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