Earthquake with magnitude of ML 1.2 on date 20-10-2021 and time 01:15:33 (UTC) in region 4 km NE Cittareale (RI)

A magnitude ML 1.2 earthquake occured in region: 4 km NE Cittareale (RI), on

  • 20-10-2021 01:15:33 (UTC)
  • 20-10-2021 03:15:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.642, 13.206 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.

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 5 482 482
Accumoli RI 7 667 1149
Amatrice RI 7 2657 3806
Montereale AQ 13 2581 6387
Capitignano AQ 16 665 7052
Borbona RI 16 617 7669
Posta RI 16 694 8363
Campotosto AQ 16 542 8905
Arquata del Tronto AP 17 1178 10083
Cascia PG 18 3217 13300
Norcia PG 19 4957 18257

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km NW of L'Aquila (69753 inhabitants)
41 Km W of Teramo (54892 inhabitants)
47 Km E of Terni (111501 inhabitants)
54 Km SE of Foligno (57155 inhabitants)
79 Km W of Montesilvano (53738 inhabitants)
81 Km NE of Guidonia Montecelio (88673 inhabitants)
82 Km NE of Tivoli (56533 inhabitants)
84 Km SE of Perugia (166134 inhabitants)
85 Km W of Pescara (121014 inhabitants)
85 Km W of Chieti (51815 inhabitants)
94 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 1.2 2021-10-20
01:15:33
42.6418 13.2057 13 2021-10-20
01:29:18
Sala Sismica INGV-Roma 96778531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 01:15:33 ± 0.07
Latitude 42.6418 ± 0.0036
Longitude 13.2057 ± 0.0049
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 96778531

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 399
Semi-minor axis of confidence ellipse (meter) 174
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 42
Circular confidence region, given by single value of horizontal uncertainty (meter) 400
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 32
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.05666
Epicentral distance of station farthest from the epicenter (degree) 0.56657
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 96778531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 01:29:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ASSB.HHN. 2021-10-20T01:15:53.66 0.6 undecidable manual S 315 0.5666 92 0.62 40
IV.FDMO.HHZ. 2021-10-20T01:15:48.27 0.3 undecidable manual S 348 0.4038 93 0.05 71
IV.CESI.HNE. 2021-10-20T01:15:48.88 0.6 undecidable manual S 329 0.4245 93 0.05 47
IV.MF5.EHZ. 2021-10-20T01:15:48.70 0.3 undecidable manual S 28 0.393 94 0.81 57
IV.ARRO.EHZ. 2021-10-20T01:15:46.35 0.3 undecidable manual S 259 0.3301 95 0.33 68
IV.GIGS.HHE. 2021-10-20T01:15:45.79 0.3 undecidable manual S 125 0.3292 95 -0.23 69
IV.TERO.HHZ. 2021-10-20T01:15:44.49 0.3 undecidable manual S 94 0.2932 96 -0.46 67
IV.ASSB.HHN. 2021-10-20T01:15:44.93 0.1 undecidable manual P 315 0.5666 92 0.03 92
IV.MMO1.EHZ. 2021-10-20T01:15:44.10 0.3 undecidable manual S 19 0.2725 96 -0.23 70
IV.MC2.EHZ. 2021-10-20T01:15:44.45 0.3 undecidable manual S 357 0.2698 96 0.19 71
IV.MF5.EHZ. 2021-10-20T01:15:42.27 0.1 undecidable manual P 28 0.393 94 0.34 89
IV.GAVE.EHZ. 2021-10-20T01:15:42.97 0.3 undecidable manual S 283 0.2347 98 -0.25 70
IV.FDMO.HHZ. 2021-10-20T01:15:42.02 0.1 undecidable manual P 348 0.4038 93 -0.1 93
IV.CESI.HNE. 2021-10-20T01:15:42.32 0.1 undecidable manual P 329 0.4245 93 -0.15 92
IV.NRCA.HHZ. 2021-10-20T01:15:41.76 0.1 undecidable manual S 341 0.2032 101 -0.54 87
IV.CAMP.HHZ. 2021-10-20T01:15:41.59 0.3 undecidable manual S 125 0.1835 103 -0.14 73
IV.GIGS.HHE. 2021-10-20T01:15:40.67 0.1 undecidable manual P 125 0.3292 95 -0.18 93
IV.TERO.HHZ. 2021-10-20T01:15:40.05 0.1 undecidable manual P 94 0.2932 96 -0.18 94
IV.LNSS.HHZ. 2021-10-20T01:15:40.25 0.1 undecidable manual S 252 0.1277 117 0.08 99
IV.ARRO.EHZ. 2021-10-20T01:15:40.94 0.1 undecidable manual P 259 0.3301 95 0.09 95
IV.RM33.EHZ. 2021-10-20T01:15:40.34 0.1 undecidable manual S 177 0.1331 115 0.03 99
IV.MC2.EHZ. 2021-10-20T01:15:39.94 0.3 undecidable manual P 357 0.2698 96 0.11 72
IV.SMA1.EHZ. 2021-10-20T01:15:39.63 0.3 undecidable manual S 97 0.0962 129 0.25 71
IV.GAVE.EHZ. 2021-10-20T01:15:39.16 0.1 undecidable manual P 283 0.2347 98 -0.07 97
IV.MMO1.EHZ. 2021-10-20T01:15:39.71 0.1 undecidable manual P 19 0.2725 96 -0.16 95
IV.T1299.EHZ. 2021-10-20T01:15:38.47 0.1 undecidable manual S 98 0.0567 147 -0.13 100
IV.NRCA.HHZ. 2021-10-20T01:15:38.47 0.1 undecidable manual P 341 0.2032 101 -0.23 94
IV.CAMP.HHZ. 2021-10-20T01:15:38.40 0.1 undecidable manual P 125 0.1835 103 0.03 98
IV.RM33.EHZ. 2021-10-20T01:15:37.73 0.1 undecidable manual P 177 0.1331 115 0.18 97
IV.SMA1.EHZ. 2021-10-20T01:15:37.21 0.1 undecidable manual P 97 0.0962 129 0.19 97
IV.LNSS.HHZ. 2021-10-20T01:15:37.58 0.1 undecidable manual P 252 0.1277 117 0.11 98
IV.T1299.EHZ. 2021-10-20T01:15:36.70 0.1 undecidable manual P 98 0.0567 147 0.14 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:1.7 0.0005975 0.16 AML other m 2021-10-20T01:15:39.90
IV.SMA1.EHE. ML:1.5 0.000315 0.12 AML other m 2021-10-20T01:15:39.97
IV.LNSS.HHN. ML:1 9.5691685E-5 0.16 AML other m 2021-10-20T01:15:40.48
IV.LNSS.HHE. ML:1.2 0.00013125 0.16 AML other m 2021-10-20T01:15:40.43
IV.RM33.EHN. ML:1 9.045E-5 0.24 AML other m 2021-10-20T01:15:40.58
IV.RM33.EHE. ML:1 9.65E-5 0.14 AML other m 2021-10-20T01:15:41.29
IV.NRCA.HHE. ML:1.4 0.000146 0.14 AML other m 2021-10-20T01:15:42.17
IV.NRCA.HHN. ML:1.3 0.000115 0.36 AML other m 2021-10-20T01:15:42.19
IV.GAVE.EHE. ML:1.1 7.0132295E-5 0.28 AML other m 2021-10-20T01:15:44.50
IV.GAVE.EHN. ML:1.2 9.46E-5 0.92 AML other m 2021-10-20T01:15:43.39
IV.LNSS.HNE. ML:1.1 0.000114484415 0.1704 AML other m 2021-10-20T01:15:40.35
IV.RM33.HNE. ML:1 8.891537E-5 0.14 AML other m 2021-10-20T01:15:41.29
IV.NRCA.HNE. ML:1.3 0.000124191735 0.14 AML other m 2021-10-20T01:15:42.24
IV.TERO.HHN. ML:1.4 0.0001182889 0.06 AML other m 2021-10-20T01:15:44.60
IV.ARRO.EHN. ML:0.6 1.6606585E-5 0.14 AML other m 2021-10-20T01:15:46.92
IV.FDMO.HHE. ML:0.5 1.09883395E-5 0.12 AML other m 2021-10-20T01:15:49.60
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