Earthquake with magnitude of ML 0.8 on date 20-11-2021 and time 23:33:43 (UTC) in region 5 km E Cittareale (RI)

A magnitude ML 0.8 earthquake occured in region: 5 km E Cittareale (RI), on

  • 20-11-2021 23:33:43 (UTC)
  • 21-11-2021 00:33:43 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.636, 13.212 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.

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
Amatrice RI 6 2657 3139
Accumoli RI 7 667 3806
Montereale AQ 13 2581 6387
Capitignano AQ 15 665 7052
Borbona RI 15 617 7669
Campotosto AQ 16 542 8211
Posta RI 16 694 8905
Arquata del Tronto AP 17 1178 10083
Cascia PG 19 3217 13300
Cagnano Amiterno AQ 20 1369 14669
Norcia PG 20 4957 19626

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km NW of L'Aquila (69753 inhabitants)
40 Km W of Teramo (54892 inhabitants)
47 Km E of Terni (111501 inhabitants)
55 Km SE of Foligno (57155 inhabitants)
78 Km W of Montesilvano (53738 inhabitants)
81 Km NE of Guidonia Montecelio (88673 inhabitants)
82 Km NE of Tivoli (56533 inhabitants)
84 Km W of Pescara (121014 inhabitants)
85 Km W of Chieti (51815 inhabitants)
85 Km SE of Perugia (166134 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.8 2021-11-20
23:33:43
42.6363 13.2122 13 2021-11-20
23:43:33
Sala Sismica INGV-Roma 97643251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-20 23:33:43 ± 0.08
Latitude 42.6363 ± 0.0036
Longitude 13.2122 ± 0.0037
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 97643251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 397
Semi-minor axis of confidence ellipse (meter) 247
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 193
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) 85
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) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.09083
Epicentral distance of station farthest from the epicenter (degree) 0.28868
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 97643251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-20 23:43:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.GAVE.EHZ. 2021-11-20T23:33:52.67 0.1 undecidable manual S 284 0.2401 96 -0.03 97
IV.NRCA.HHZ. 2021-11-20T23:33:51.65 0.1 undecidable manual S 340 0.2095 98 -0.16 95
IV.RM33.EHZ. 2021-11-20T23:33:49.28 0.1 undecidable manual S 179 0.1268 114 -0.16 96
IV.TERO.HHZ. 2021-11-20T23:33:49.40 0.6 undecidable manual P 93 0.2887 94 -0.07 48
IV.LNSS.HHZ. 2021-11-20T23:33:49.52 0.1 undecidable manual S 255 0.1304 113 -0.01 99
IV.MMO1.EHZ. 2021-11-20T23:33:49.28 1.0 undecidable manual P 18 0.2761 95 0.02 24
IV.SMA1.EHZ. 2021-11-20T23:33:48.48 0.1 undecidable manual S 94 0.0908 129 -0.04 100
IV.NRCA.HHZ. 2021-11-20T23:33:48.14 0.6 positive manual P 340 0.2095 98 0.01 49
IV.GAVE.EHZ. 2021-11-20T23:33:48.76 0.3 negative manual P 284 0.2401 96 0.11 72
IV.SMA1.EHZ. 2021-11-20T23:33:46.48 0.6 negative manual P 94 0.0908 129 0.24 48
IV.RM33.EHZ. 2021-11-20T23:33:46.85 0.3 positive manual P 179 0.1268 114 0.09 74
IV.LNSS.HHZ. 2021-11-20T23:33:46.96 0.1 positive manual P 255 0.1304 113 0.14 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.3 0.0002055 0.26 AML other m 2021-11-20T23:33:48.83
IV.RM33.EHE. ML:0.7 4.26E-5 0.28 AML other m 2021-11-20T23:33:49.56
IV.SMA1.EHN. ML:0.8 6.675E-5 0.74 AML other m 2021-11-20T23:33:49.60
IV.LNSS.HHN. ML:0.9 6.535E-5 0.34 AML other m 2021-11-20T23:33:49.68
IV.LNSS.HHE. ML:0.9 7.22E-5 0.16 AML other m 2021-11-20T23:33:49.81
IV.RM33.EHN. ML:0.6 3.635E-5 0.14 AML other m 2021-11-20T23:33:49.92
IV.NRCA.HHE. ML:1 6.715E-5 0.1 AML other m 2021-11-20T23:33:51.91
IV.NRCA.HHN. ML:0.8 3.335E-5 0.1 AML other m 2021-11-20T23:33:52.56
IV.GAVE.EHE. ML:0.7 2.365E-5 1.52 AML other m 2021-11-20T23:33:53.13
IV.GAVE.EHN. ML:0.8 2.935E-5 0.5 AML other m 2021-11-20T23:33:53.00
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