Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 18-01-2021 and time 03:20:23 (Italy) in region 6 km NE Cittareale (RI)

A magnitude ML 1.7 earthquake occured in region: 6 km NE Cittareale (RI), on

  • 18-01-2021 02:20:23 (UTC)
  • 18-01-2021 03:20:23 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.66, 13.19 at 11 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 6 667 1149
Amatrice RI 9 2657 3806
Arquata del Tronto AP 15 1178 4984
Cascia PG 16 3217 8201
Montereale AQ 16 2581 10782
Norcia PG 16 4957 15739
Borbona RI 17 617 16356
Posta RI 17 694 17050
Capitignano AQ 18 665 17715
Campotosto AQ 19 542 18257
Monteleone di Spoleto PG 20 599 18856

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)
51 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)
87 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
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 1.7 2021-01-18
02:20:23		 42.66 13.19 11 2021-01-18
02:34:51		 Sala Sismica INGV-Roma 86343121
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-18 02:20:23 ± 0.08
Latitude 42.66 ± 0.01
Longitude 13.19 ± 0.01
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86343121

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 559
Semi-minor axis of confidence ellipse (meter) 490
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 281
Circular confidence region, given by single value of horizontal uncertainty (meter) 560
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 73
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.11062
Epicentral distance of station farthest from the epicenter (degree) 0.49553
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 86343121
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-18 02:34:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MNTT.EHZ. 2021-01-18T02:20:34.71 0.1 undecidable manual P 37 0.4955 50 1.02 68
IV.TERO.HHZ. 2021-01-18T02:20:34.83 0.1 undecidable manual S 98 0.3058 50 -0.53 87
IV.MMO1.EHZ. 2021-01-18T02:20:33.87 0.3 undecidable manual S 23 0.2554 50 0.02 74
IV.MF5.EHZ. 2021-01-18T02:20:32.18 0.1 undecidable manual P 31 0.3786 50 0.5 87
IV.CESI.HHZ. 2021-01-18T02:20:32.07 0.1 undecidable manual P 328 0.4002 50 0.01 96
IV.CSP1.EHZ. 2021-01-18T02:20:32.61 0.1 undecidable manual P 1 0.4272 50 0.09 94
IV.MTRA.HNZ. 2021-01-18T02:20:31.26 0.1 undecidable manual S 58 0.1772 118 -0.21 96
IV.NRCA.HHZ. 2021-01-18T02:20:31.17 0.1 undecidable manual S 342 0.179 118 -0.36 93
IV.FDMO.HHZ. 2021-01-18T02:20:31.31 0.1 undecidable manual P 348 0.3795 50 -0.4 89
IV.TERO.HHZ. 2021-01-18T02:20:30.22 0.1 undecidable manual P 98 0.3058 50 -0.22 94
IV.ARRO.EHZ. 2021-01-18T02:20:30.58 0.1 undecidable manual P 255 0.3247 50 -0.18 94
IV.RM33.EHZ. 2021-01-18T02:20:30.53 0.1 undecidable manual S 174 0.1556 121 -0.24 96
IV.LNSS.HHZ. 2021-01-18T02:20:29.92 0.1 undecidable manual S 241 0.1268 127 0.07 100
IV.SMA1.EHZ. 2021-01-18T02:20:29.52 0.1 undecidable manual S 108 0.1106 131 0.15 99
IV.MMO1.EHZ. 2021-01-18T02:20:29.67 0.1 undecidable manual P 23 0.2554 50 0.09 97
IV.NRCA.HHZ. 2021-01-18T02:20:28.13 0.1 undecidable manual P 342 0.179 118 -0.1 98
IV.MTRA.HNZ. 2021-01-18T02:20:28.14 0.1 undecidable manual P 58 0.1772 118 -0.06 99
IV.RM33.EHZ. 2021-01-18T02:20:27.88 0.1 undecidable manual P 174 0.1556 121 0.08 99
IV.LNSS.HHZ. 2021-01-18T02:20:27.44 0.1 undecidable manual P 241 0.1268 127 0.18 98
IV.SMA1.EHZ. 2021-01-18T02:20:27.32 0.1 undecidable manual P 108 0.1106 131 0.34 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHE. ML:1.9 0.0008785 0.48 AML other m 2021-01-18T02:20:30.31
IV.LNSS.HNE. ML:1.9 0.000848 0.46 AML other m 2021-01-18T02:20:30.08
IV.LNSS.HNN. ML:1.8 0.000657 0.16 AML other m 2021-01-18T02:20:30.13
IV.LNSS.HHN. ML:1.8 0.000738 0.14 AML other m 2021-01-18T02:20:30.13
IV.SMA1.EHE. ML:2.2 0.00187 0.28 AML other m 2021-01-18T02:20:30.19
IV.SMA1.EHN. ML:1.7 0.000615 1.58 AML other m 2021-01-18T02:20:30.86
IV.MTRA.HNN. ML:1.8 0.0004385 0.16 AML other m 2021-01-18T02:20:31.37
IV.RM33.EHN. ML:1.4 0.00022 0.36 AML other m 2021-01-18T02:20:31.46
IV.RM33.HNN. ML:1.6 0.0002945 1.04 AML other m 2021-01-18T02:20:31.46
IV.MTRA.EHN. ML:1.8 0.0004165 0.16 AML other m 2021-01-18T02:20:31.38
IV.NRCA.HHN. ML:1.7 0.000361 0.9 AML other m 2021-01-18T02:20:31.47
IV.RM33.HNE. ML:1.5 0.000283 0.16 AML other m 2021-01-18T02:20:31.60
IV.RM33.EHE. ML:1.5 0.000269 0.14 AML other m 2021-01-18T02:20:31.60
IV.MTRA.HNE. ML:1.8 0.000496 1.1 AML other m 2021-01-18T02:20:31.93
IV.MTRA.EHE. ML:1.8 0.0004715 1.7 AML other m 2021-01-18T02:20:31.09
IV.NRCA.HHE. ML:1.9 0.000629 0.16 AML other m 2021-01-18T02:20:31.89
IV.TERO.HHN. ML:1.5 0.0001425 0.94 AML other m 2021-01-18T02:20:35.23
IV.TERO.HHE. ML:1.5 0.00012685 0.12 AML other m 2021-01-18T02:20:35.70
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download