Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 04-01-2021 and time 01:31:00 (UTC) in region 1 km NW Morro Reatino (RI)

A magnitude ML 1.1 earthquake occured in region: 1 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) 42.5350, 12.8210 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Morro Reatino RI 1 373 373
Labro RI 2 374 747
Rivodutri RI 4 1253 2000
Colli sul Velino RI 5 533 2533
Polino TR 6 233 2766
Poggio Bustone RI 6 2055 4821
Arrone TR 7 2763 7584
Montefranco TR 8 1276 8860
Ferentillo TR 10 1913 10773
Greccio RI 10 1558 12331
Cantalice RI 10 2755 15086
Leonessa RI 12 2435 17521
Stroncone TR 14 4917 22438
Contigliano RI 14 3783 26221
Terni TR 15 111501 137722
Rieti RI 15 47698 185420
Monteleone di Spoleto PG 17 599 186019
Cottanello RI 18 563 186582
Configni RI 19 633 187215
Cittaducale RI 20 6828 194043
Scheggino PG 20 461 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)
74 Km W of Teramo (54892 inhabitants)
77 Km NE of Roma (2864731 inhabitants)
94 Km N of Velletri (53303 inhabitants)
97 Km NE of Fiumicino (78395 inhabitants)
98 Km NE of Civitavecchia (52991 inhabitants)
100 Km N of Pomezia (62966 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.1 2021-01-04
01:31:00		 42.5352 12.8212 10 2021-07-12
16:54:55		 Bollettino Sismico Italiano INGV 86246391
Reviewed
Rev100 		ML 1.0 2021-01-04
01:31:00		 42.5385 12.8238 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 ± 0.06
Latitude 42.5352 ± 0.0027
Longitude 12.8212 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86246391

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 300
Semi-minor axis of confidence ellipse (meter) 290
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 338
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
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 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.06025
Epicentral distance of station farthest from the epicenter (degree) 0.52071
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 86246391
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-14 14:50:32

ML:1.0

Field Value
Value 1.0
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.ASSB.HHN. 2021-01-04T01:31:19.15 0.3 undecidable manual S 347 0.5207 50 0.19 69
IV.CESI.HHE. 2021-01-04T01:31:17.76 0.6 undecidable manual S 7 0.4739 50 0.21 46
IV.FIAM.HHE. 2021-01-04T01:31:14.00 0.3 undecidable manual S 141 0.3444 50 0.26 71
IV.T1299.EHZ. 2021-01-04T01:31:14.00 0.6 undecidable manual S 74 0.3534 50 0.01 50
IV.NRCA.HHZ. 2021-01-04T01:31:14.32 0.3 undecidable manual S 36 0.3678 50 -0.1 73
IV.SRES.HHE. 2021-01-04T01:31:14.49 0.3 undecidable manual S 218 0.3759 50 -0.18 72
IV.MOMA.HHZ. 2021-01-04T01:31:13.43 0.6 undecidable manual S 326 0.3256 50 0.25 47
IV.ASSB.HHN. 2021-01-04T01:31:11.03 0.3 undecidable manual P 347 0.5207 50 -0.25 68
IV.CESI.HHE. 2021-01-04T01:31:10.32 0.1 undecidable manual P 7 0.4739 50 -0.15 94
IV.SRES.HHE. 2021-01-04T01:31:09.17 0.3 undecidable manual P 218 0.3759 50 0.36 69
IV.GAVE.EHZ. 2021-01-04T01:31:08.27 0.1 undecidable manual S 19 0.1664 118 0.21 99
IV.FIAM.HHE. 2021-01-04T01:31:08.30 0.6 undecidable manual P 141 0.3444 50 0.03 49
IV.T1299.EHZ. 2021-01-04T01:31:08.18 0.3 undecidable manual P 74 0.3534 50 -0.23 71
IV.LNSS.HHZ. 2021-01-04T01:31:08.30 0.3 undecidable manual S 67 0.1745 117 -0.06 76
IV.NRCA.HHZ. 2021-01-04T01:31:08.43 0.3 undecidable manual P 36 0.3678 50 -0.23 71
IV.CESX.HHZ. 2021-01-04T01:31:08.69 0.3 undecidable manual S 293 0.1880 115 -0.11 75
IV.MOMA.HHZ. 2021-01-04T01:31:07.81 0.3 undecidable manual P 326 0.3256 50 -0.14 73
IV.CESX.HHZ. 2021-01-04T01:31:05.39 0.6 undecidable manual P 293 0.1880 115 -0.03 51
IV.GAVE.EHZ. 2021-01-04T01:31:05.14 0.1 positive manual P 19 0.1664 118 0.15 100
IV.LNSS.HHZ. 2021-01-04T01:31:05.06 0.3 undecidable manual P 67 0.1745 117 -0.11 76
IV.ARRO.EHZ. 2021-01-04T01:31:04.88 0.3 undecidable manual S 317 0.0603 146 -0.07 78
IV.ARRO.EHZ. 2021-01-04T01:31:03.27 0.3 undecidable manual P 317 0.0603 146 0.08 78
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHN. ML:1.0 0.000169 0.16 AML other m 2021-01-04T01:31:05.22
IV.ARRO.EHE. ML:0.8 0.00010564999999999999 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 0.00010855000000000001 0.12 AML other m 2021-01-04T01:31:08.52
IV.LNSS.HHN. ML:1.1 0.00009525 0.44 AML other m 2021-01-04T01:31:09.00
IV.LNSS.HHE. ML:1.1 0.0000975 0.16 AML other m 2021-01-04T01:31:09.16
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download