Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 31-03-2021 and time 15:45:47 (UTC) in region 2 km NW Labro (RI)

A magnitude ML 1.3 earthquake occured in region: 2 km NW Labro (RI), on

  • 31-03-2021 15:45:47 (UTC)
  • 31-03-2021 17:45:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.5340, 12.7850 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.

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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
Labro RI 2 374 374
Colli sul Velino RI 4 533 907
Morro Reatino RI 4 373 1280
Arrone TR 6 2763 4043
Rivodutri RI 6 1253 5296
Montefranco TR 7 1276 6572
Polino TR 8 233 6805
Greccio RI 9 1558 8363
Poggio Bustone RI 9 2055 10418
Ferentillo TR 10 1913 12331
Stroncone TR 11 4917 17248
Terni TR 12 111501 128749
Cantalice RI 12 2755 131504
Contigliano RI 14 3783 135287
Leonessa RI 15 2435 137722
Rieti RI 16 47698 185420
Cottanello RI 16 563 185983
Configni RI 17 633 186616
Montasola RI 18 395 187011
Monteleone di Spoleto PG 19 599 187610

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km E of Terni (111501 inhabitants)
48 Km S of Foligno (57155 inhabitants)
54 Km W of L'Aquila (69753 inhabitants)
57 Km E of Viterbo (67173 inhabitants)
59 Km N of Guidonia Montecelio (88673 inhabitants)
63 Km N of Tivoli (56533 inhabitants)
72 Km SE of Perugia (166134 inhabitants)
75 Km NE of Roma (2864731 inhabitants)
77 Km W of Teramo (54892 inhabitants)
94 Km N of Velletri (53303 inhabitants)
95 Km NE of Civitavecchia (52991 inhabitants)
96 Km NE of Fiumicino (78395 inhabitants)
99 Km N of Pomezia (62966 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.3 2021-03-31
15:45:47		 42.5337 12.7848 9 2021-03-31
15:52:30		 Sala Sismica INGV-Roma 88645541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-31 15:45:47 ± 0.11
Latitude 42.5337 ± 0.0045
Longitude 12.7848 ± 0.0061
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88645541

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 590
Semi-minor axis of confidence ellipse (meter) 425
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 50
Circular confidence region, given by single value of horizontal uncertainty (meter) 590.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 193
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.54949
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 88645541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-31 15:52:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MCIV.CHZ. 2021-03-31T15:46:17.94 3.0 undecidable manual S 0.06 0
IV.EL6.EHZ. 2021-03-31T15:46:16.73 3.0 undecidable manual S 0.24 0
IV.FDMO.HHZ. 2021-03-31T15:46:06.40 0.3 undecidable manual S 24 60.9945 50 0.02 71
IV.CESI.HHZ. 2021-03-31T15:46:04.43 0.3 undecidable manual S 11 53.2023 50 0.13 70
IV.MC2.EHZ. 2021-03-31T15:46:04.55 0.3 undecidable manual S 38 53.3022 50 0.22 69
IV.SMA1.EHZ. 2021-03-31T15:46:02.17 0.3 undecidable manual S 76 46.2204 50 -0.27 69
IV.FIAM.HHZ. 2021-03-31T15:46:00.54 0.3 undecidable manual S 137 40.1265 50 -0.27 70
IV.MOMA.HHZ. 2021-03-31T15:45:59.06 0.3 undecidable manual S 330 34.743 50 -0.31 70
IV.FDMO.HHZ. 2021-03-31T15:45:57.99 0.6 undecidable manual P 24 60.9945 50 -0.26 45
IV.MC2.EHZ. 2021-03-31T15:45:57.13 0.3 undecidable manual P 38 53.3022 50 0.07 71
IV.SMA1.EHZ. 2021-03-31T15:45:56.33 0.6 undecidable manual P 76 46.2204 50 0.36 45
IV.CESI.HHZ. 2021-03-31T15:45:56.90 0.6 undecidable manual P 11 53.2023 50 -0.14 47
IV.FIAM.HHZ. 2021-03-31T15:45:55.12 0.3 undecidable manual P 137 40.1265 50 0.09 73
IV.LNSS.HHZ. 2021-03-31T15:45:55.39 0.3 undecidable manual S 70 22.2555 112 -0.04 76
IV.MOMA.HHZ. 2021-03-31T15:45:54.50 0.3 undecidable manual P 330 34.743 50 0.3 70
IV.GAVE.EHZ. 2021-03-31T15:45:54.47 0.3 undecidable manual S 27 19.7691 114 -0.16 74
IV.LNSS.HHZ. 2021-03-31T15:45:52.17 0.3 undecidable manual P 70 22.2555 112 0.25 73
IV.GAVE.EHZ. 2021-03-31T15:45:51.50 0.3 undecidable manual P 27 19.7691 114 0.04 76
IV.ARRO.EHZ. 2021-03-31T15:45:50.36 0.3 undecidable manual S 343 5.2947 149 -0.33 73
IV.ARRO.EHZ. 2021-03-31T15:45:49.41 0.1 positive manual P 343 5.2947 149 0.22 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHE. ML:1.5 0.00025 0.34 AML other m 2021-03-31T15:45:55.94
IV.GAVE.EHN. ML:1.5 0.000219 0.14 AML other m 2021-03-31T15:45:56.48
IV.LNSS.HHE. ML:1.4 0.0001525 0.58 AML other m 2021-03-31T15:45:56.47
IV.LNSS.HHN. ML:1.3 0.00015 0.9 AML other m 2021-03-31T15:45:58.70
IV.MOMA.HHN. ML:1.4 0.00009575 1.78 AML other m 2021-03-31T15:45:59.99
IV.MOMA.HHE. ML:1.2 0.00007115 0.84 AML other m 2021-03-31T15:46:00.76
IV.CESI.HHN. ML:1.6 0.00009570000000000001 1.52 AML other m 2021-03-31T15:46:04.81
IV.SMA1.EHN. ML:1.0 0.0000305 0.3 AML other m 2021-03-31T15:46:04.83
IV.CESI.HHE. ML:1.4 0.000059550000000000004 0.48 AML other m 2021-03-31T15:46:05.61
IV.FDMO.HHN. ML:1.2 0.0000347 0.16 AML other m 2021-03-31T15:46:06.85
IV.FDMO.HHE. ML:1.3 0.000041 0.16 AML other m 2021-03-31T15:46:07.00
IV.SMA1.EHE. ML:1.0 0.0000283 0.78 AML other m 2021-03-31T15:46:08.56
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