Earthquake with magnitude of ML 1.0 on date 04-01-2021 and time 01:31:00 (UTC) in region 2 km NW Morro Reatino (RI)

A magnitude ML 1.0 earthquake occured in region: 2 km NW Morro Reatino (RI), on

  • 04-01-2021 01:31:00 (UTC)
  • 04-01-2021 02:31:00 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.54, 12.82 at 9 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
Morro Reatino RI 2 373 373
Labro RI 2 374 747
Rivodutri RI 4 1253 2000
Polino TR 6 233 2233
Colli sul Velino RI 6 533 2766
Poggio Bustone RI 7 2055 4821
Arrone TR 7 2763 7584
Montefranco TR 8 1276 8860
Ferentillo TR 10 1913 10773
Cantalice RI 10 2755 13528
Greccio RI 10 1558 15086
Leonessa RI 12 2435 17521
Stroncone TR 14 4917 22438
Terni TR 15 111501 133939
Contigliano RI 15 3783 137722
Rieti RI 15 47698 185420
Monteleone di Spoleto PG 16 599 186019
Cottanello RI 18 563 186582
Configni RI 20 633 187215
Scheggino PG 20 461 187676
Cittaducale RI 20 6828 194504

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km E of Terni (111501 inhabitants)
48 Km S of Foligno (57155 inhabitants)
52 Km W of L'Aquila (69753 inhabitants)
60 Km N of Guidonia Montecelio (88673 inhabitants)
60 Km E of Viterbo (67173 inhabitants)
64 Km N of Tivoli (56533 inhabitants)
73 Km SE of Perugia (166134 inhabitants)
73 Km W of Teramo (54892 inhabitants)
77 Km NE of Roma (2864731 inhabitants)
95 Km N of Velletri (53303 inhabitants)
98 Km NE of Fiumicino (78395 inhabitants)
98 Km NE of Civitavecchia (52991 inhabitants)
100 Km N of Pomezia (62966 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 1.0 2021-01-04
01:31:00
42.54 12.82 9 2021-01-04
01:42:34
Sala Sismica INGV-Roma 86003081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-04 01:31:00 ± 0.12
Latitude 42.54 ± 0.01
Longitude 12.82 ± 0.01
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86003081

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1046
Semi-minor axis of confidence ellipse (meter) 443
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 344
Circular confidence region, given by single value of horizontal uncertainty (meter) 1050
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 11
Number of defining phases 11
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) 0.05936
Epicentral distance of station farthest from the epicenter (degree) 0.38041
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:1

Field Value
Value 1
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 86003081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-04 01:42:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SRES.HHE. 2021-01-04T01:31:09.61 0.3 undecidable manual P 218 0.3804 50 0.46 66
IV.LNSS.HHZ. 2021-01-04T01:31:08.30 0.3 undecidable manual S 68 0.1718 116 -0.05 75
IV.FIAM.HHE. 2021-01-04T01:31:08.26 0.6 undecidable manual P 141 0.3462 50 -0.31 46
IV.CESX.HHZ. 2021-01-04T01:31:08.69 0.3 undecidable manual S 292 0.188 114 -0.23 72
IV.GAVE.EHZ. 2021-01-04T01:31:08.27 0.1 undecidable manual S 19 0.1619 117 0.25 96
IV.NRCA.HHZ. 2021-01-04T01:31:08.52 0.3 negative manual P 36 0.3642 50 -0.35 68
IV.GAVE.EHZ. 2021-01-04T01:31:05.14 0.1 positive manual P 19 0.1619 117 0.09 99
IV.LNSS.HHZ. 2021-01-04T01:31:05.17 0.6 negative manual P 68 0.1718 116 -0.07 50
IV.CESX.HHZ. 2021-01-04T01:31:05.86 1.0 undecidable manual P 292 0.188 114 0.29 24
IV.ARRO.EHZ. 2021-01-04T01:31:04.80 0.1 undecidable manual S 313 0.0594 145 -0.14 100
IV.ARRO.EHZ. 2021-01-04T01:31:03.34 0.3 undecidable manual P 313 0.0594 145 0.07 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHN. ML:1 0.000169 0.16 AML other m 2021-01-04T01:31:05.22
IV.ARRO.EHE. ML:0.8 0.00010565 1.4 AML other m 2021-01-04T01:31:05.87
IV.GAVE.EHN. ML:1.1 0.0001074 0.34 AML other m 2021-01-04T01:31:08.74
IV.GAVE.EHE. ML:1.1 0.00010855 0.12 AML other m 2021-01-04T01:31:08.52
IV.LNSS.HHN. ML:1.1 9.525E-5 0.44 AML other m 2021-01-04T01:31:09.00
IV.LNSS.HHE. ML:1.1 9.75E-5 0.16 AML other m 2021-01-04T01:31:09.16
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