Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 25-03-2021 and time 05:19:48 (Italy) in region 9 km N Montecchio (TR)

A magnitude ML 1.5 earthquake occured in region: 9 km N Montecchio (TR), on

  • 25-03-2021 04:19:48 (UTC)
  • 25-03-2021 05:19:48 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7400, 12.3020 at 8 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
Montecchio TR 9 1676 1676
Todi PG 10 16851 18527
Baschi TR 10 2722 21249
Monte Castello di Vibio PG 12 1567 22816
Guardea TR 13 1836 24652
Castiglione in Teverina VT 13 2329 26981
Avigliano Umbro TR 14 2558 29539
Fratta Todina PG 14 1839 31378
San Venanzo TR 15 2218 33596
Orvieto TR 16 20630 54226
Alviano TR 17 1463 55689
Porano TR 17 1966 57655
Civitella d'Agliano VT 17 1640 59295
Montecastrilli TR 18 5022 64317
Lugnano in Teverina TR 19 1494 65811
Massa Martana PG 19 3770 69581
Marsciano PG 19 18902 88483
Lubriano VT 20 909 89392
Graffignano VT 20 2292 91684

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km NW of Terni (111501 inhabitants)
39 Km NE of Viterbo (67173 inhabitants)
41 Km SW of Foligno (57155 inhabitants)
42 Km S of Perugia (166134 inhabitants)
83 Km NE of Civitavecchia (52991 inhabitants)
88 Km SE of Arezzo (99543 inhabitants)
89 Km NW of Guidonia Montecelio (88673 inhabitants)
95 Km N of Roma (2864731 inhabitants)
96 Km NW of Tivoli (56533 inhabitants)
97 Km E of Grosseto (82087 inhabitants)
100 Km W of L'Aquila (69753 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
Bulletin
Rev1000 		ML 1.5 2021-03-25
04:19:48		 42.7402 12.3015 8 2021-07-12
16:55:04		 Bollettino Sismico Italiano INGV 88585801
Reviewed
Rev100 		ML 1.1 2021-03-25
04:19:48		 42.7483 12.3008 10 2021-03-25
04:58:47		 Sala Sismica INGV-Roma 88450101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-25 04:19:48 ± 0.08
Latitude 42.7402 ± 0.0036
Longitude 12.3015 ± 0.0049
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88585801

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 452
Semi-minor axis of confidence ellipse (meter) 237
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 210
Circular confidence region, given by single value of horizontal uncertainty (meter) 450.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 74
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 24
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.63762
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 88585801
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-14 10:34:32

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 88450101
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-25 04:58:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
ST.CARE.EHZ. 2021-03-25T04:21:29.29 3.0 undecidable manual Sn -3.67 0
IV.MSRU.HHZ. 2021-03-25T04:21:15.70 3.0 negative manual Pg 14.57 0
IV.PLLN.EHZ. 2021-03-25T04:21:02.37 3.0 positive manual Pn 4.48 0
IV.COLB.HHZ. 2021-03-25T04:20:56.36 3.0 undecidable manual Sg 0.23 0
IV.SOLUN.HHZ. 2021-03-25T04:20:55.39 3.0 negative manual Pn 0.85 0
IV.FERS.EHZ. 2021-03-25T04:20:24.02 3.0 negative manual Pn 0.79 0
IV.ATMI.HHZ. 2021-03-25T04:20:09.62 0.6 undecidable manual S 358 65.9895 50 0.64 40
IV.BARO.EHE. 2021-03-25T04:20:07.22 0.6 undecidable manual S 201 58.2972 50 0.28 45
IV.MURB.HNZ. 2021-03-25T04:20:07.45 0.3 undecidable manual S 17 60.7947 50 -0.14 69
IV.ATVA.EHZ. 2021-03-25T04:20:06.87 0.3 undecidable manual S 359 59.7957 50 -0.45 65
IV.MCIV.CHZ. 2021-03-25T04:20:05.47 0.6 undecidable manual S 275 51.1155 50 0.46 44
IV.ASSB.HHE. 2021-03-25T04:20:03.72 0.6 undecidable manual S 41 44.3223 50 0.5 44
IV.SAMA.EHZ. 2021-03-25T04:20:02.55 3.0 undecidable manual P -0.75 0
IV.ARRO.EHE. 2021-03-25T04:20:02.27 0.3 undecidable manual S 115 41.8248 50 -0.28 69
IV.ATMI.HHZ. 2021-03-25T04:20:00.15 0.1 undecidable manual P 358 65.9895 50 -0.1 92
IV.SACS.HHZ. 2021-03-25T04:20:00.50 0.6 undecidable manual S 291 34.1436 50 0.02 49
IV.CAFI.HNE. 2021-03-25T04:20:00.78 0.3 undecidable manual P 338 70.7736 50 -0.21 67
IV.MURB.HNZ. 2021-03-25T04:19:59.79 0.3 undecidable manual P 17 60.7947 50 0.34 66
IV.BARO.EHE. 2021-03-25T04:19:59.10 0.6 undecidable manual P 201 58.2972 50 0.03 47
IV.SRES.HHN. 2021-03-25T04:19:59.30 0.3 undecidable manual P 163 58.3971 50 0.22 68
IV.ATVA.EHZ. 2021-03-25T04:19:59.01 0.3 undecidable manual P 359 59.7957 50 -0.28 67
IV.MCIV.CHZ. 2021-03-25T04:19:58.01 0.1 undecidable manual P 275 51.1155 50 0.05 95
IV.MOMA.HHZ. 2021-03-25T04:19:57.07 0.6 undecidable manual S 72 22.9548 110 0.26 48
IV.MGAB.HHZ. 2021-03-25T04:19:57.43 0.6 undecidable manual S 321 24.5532 109 0.1 49
IV.CESX.HHZ. 2021-03-25T04:19:57.91 0.3 undecidable manual S 122 27.4503 107 -0.37 70
IV.ASSB.HHE. 2021-03-25T04:19:56.88 0.1 undecidable manual P 41 44.3223 50 -0.04 97
IV.ARRO.EHE. 2021-03-25T04:19:56.53 0.1 undecidable manual P 115 41.8248 50 0 98
IV.SACS.HHZ. 2021-03-25T04:19:54.99 0.1 undecidable manual P 291 34.1436 50 -0.35 92
IV.CESX.HHZ. 2021-03-25T04:19:54.09 0.1 undecidable manual P 122 27.4503 107 0.02 100
IV.MOMA.HHZ. 2021-03-25T04:19:53.53 0.1 undecidable manual P 72 22.9548 110 0.31 95
IV.MGAB.HHZ. 2021-03-25T04:19:53.40 0.1 undecidable manual P 321 24.5532 109 -0.12 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHN. ML:1.0 0.00004816743 0.1984 AML other m 2021-03-25T04:19:58.69
IV.MGAB.HNN. ML:1.7 0.00033899999999999995 0.22 AML other m 2021-03-25T04:19:58.81
IV.MGAB.HHE. ML:1.7 0.00033150000000000003 0.3 AML other m 2021-03-25T04:19:59.55
IV.MGAB.HNE. ML:1.7 0.00034233 0.3008 AML other m 2021-03-25T04:19:59.55
IV.MGAB.HHN. ML:1.7 0.00031 0.16 AML other m 2021-03-25T04:19:59.74
IV.CESX.HHE. ML:0.9 0.00004451474 0.3008 AML other m 2021-03-25T04:20:00.54
IV.SACS.HNN. ML:1.5 0.000134865335 1.3216 AML other m 2021-03-25T04:20:01.20
IV.SACS.HHN. ML:1.1 0.0000537104 0.8 AML other m 2021-03-25T04:20:03.57
IV.SACS.HHE. ML:1.1 0.000051411625 0.8384 AML other m 2021-03-25T04:20:06.31
IV.SACS.HNE. ML:1.5 0.00014114585 0.9408 AML other m 2021-03-25T04:20:09.40
IV.ATMI.HHE. ML:1.8 0.000105402255 0.2208 AML other m 2021-03-25T04:20:13.48
IV.ATMI.HHN. ML:1.9 0.0001465606 0.3392 AML other m 2021-03-25T04:20:15.60
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