Earthquake with magnitude of ML 1.1 on date 20-01-2021 and time 03:59:06 (Italy) in region 4 km SW Borbona (RI)

A magnitude ML 1.1 earthquake occured in region: 4 km SW Borbona (RI), on

  • 20-01-2021 02:59:06 (UTC)
  • 20-01-2021 03:59:06 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.49, 13.11 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
Borbona RI 4 617 617
Posta RI 4 694 1311
Micigliano RI 6 127 1438
Antrodoco RI 8 2588 4026
Borgo Velino RI 10 972 4998
Cagnano Amiterno AQ 10 1369 6367
Castel Sant'Angelo RI 12 1308 7675
Montereale AQ 12 2581 10256
Leonessa RI 15 2435 12691
Barete AQ 15 737 13428
Cittareale RI 15 482 13910
Capitignano AQ 16 665 14575
Pizzoli AQ 16 4326 18901
Cantalice RI 17 2755 21656
Cittaducale RI 17 6828 28484
Scoppito AQ 18 3727 32211
Poggio Bustone RI 18 2055 34266

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km NW of L'Aquila (69753 inhabitants)
39 Km E of Terni (111501 inhabitants)
53 Km W of Teramo (54892 inhabitants)
62 Km SE of Foligno (57155 inhabitants)
62 Km NE of Guidonia Montecelio (88673 inhabitants)
63 Km NE of Tivoli (56533 inhabitants)
83 Km E of Viterbo (67173 inhabitants)
84 Km NE of Roma (2864731 inhabitants)
86 Km W of Montesilvano (53738 inhabitants)
88 Km W of Chieti (51815 inhabitants)
91 Km SE of Perugia (166134 inhabitants)
91 Km W of Pescara (121014 inhabitants)
93 Km N of Velletri (53303 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 1.1 2021-01-20
02:59:06
42.49 13.11 9 2021-01-20
03:08:04
Sala Sismica INGV-Roma 86388311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-20 02:59:06 ± 0.26
Latitude 42.49 ± 0.01
Longitude 13.11 ± 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 86388311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1397
Semi-minor axis of confidence ellipse (meter) 507
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 202
Circular confidence region, given by single value of horizontal uncertainty (meter) 1400
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 264
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.08184
Epicentral distance of station farthest from the epicenter (degree) 0.34804
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 86388311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-20 03:08:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.NRCA.HHZ. 2021-01-20T02:59:19.40 0.6 undecidable manual S 1 0.348 50 -0.16 46
IV.SMA1.EHZ. 2021-01-20T02:59:15.63 0.3 undecidable manual S 49 0.2212 110 0.17 71
IV.NRCA.HHZ. 2021-01-20T02:59:13.89 0.1 undecidable manual P 1 0.348 50 -0.09 94
IV.LNSS.HHZ. 2021-01-20T02:59:12.12 0.1 undecidable manual S 337 0.1277 123 -0.08 99
IV.SMA1.EHZ. 2021-01-20T02:59:11.88 0.3 undecidable manual P 49 0.2212 110 0.26 70
IV.RM33.EHZ. 2021-01-20T02:59:10.57 0.1 undecidable manual S 73 0.0818 135 -0.27 96
IV.RM33.EHZ. 2021-01-20T02:59:09.00 0.1 undecidable manual P 73 0.0818 135 0.05 100
IV.LNSS.HHZ. 2021-01-20T02:59:09.88 0.1 undecidable manual P 337 0.1277 123 0.15 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHE. ML:1.2 0.000208 0.22 AML other m 2021-01-20T02:59:11.07
IV.RM33.EHN. ML:1.1 0.0001645 0.7 AML other m 2021-01-20T02:59:11.60
IV.LNSS.HHN. ML:1 0.000101 0.96 AML other m 2021-01-20T02:59:13.92
IV.LNSS.HHE. ML:1.2 0.000155 0.4 AML other m 2021-01-20T02:59:13.32
IV.SMA1.EHN. ML:1.3 0.0001175 0.26 AML other m 2021-01-20T02:59:16.14
IV.SMA1.EHE. ML:1.3 0.0001175 0.24 AML other m 2021-01-20T02:59:16.24
IV.NRCA.HHE. ML:0.8 2.705E-5 0.78 AML other m 2021-01-20T02:59:19.29
IV.NRCA.HHN. ML:0.7 2.205E-5 0.8 AML other m 2021-01-20T02:59:20.28
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