Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 09-04-2021 and time 00:12:47 (Italy) in region 6 km N Valle Castellana (TE)

A magnitude ML 1.1 earthquake occured in region: 6 km N Valle Castellana (TE), on

  • 08-04-2021 22:12:47 (UTC)
  • 09-04-2021 00:12:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7870, 13.4850 at 19 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
Valle Castellana TE 6 977 977
Acquasanta Terme AP 6 2916 3893
Roccafluvione AP 8 2010 5903
Venarotta AP 11 2066 7969
Ascoli Piceno AP 11 49407 57376
Rocca Santa Maria TE 12 537 57913
Folignano AP 13 9241 67154
Palmiano AP 13 196 67350
Montegallo AP 14 523 67873
Civitella del Tronto TE 15 5116 72989
Arquata del Tronto AP 15 1178 74167
Maltignano AP 17 2401 76568
Campli TE 18 7209 83777
Montemonaco AP 18 604 84381
Cortino TE 18 656 85037
Sant'Egidio alla Vibrata TE 20 9811 94848
Appignano del Tronto AP 20 1785 96633
Force AP 20 1354 97987
Rotella AP 20 906 98893
Comunanza AP 20 3166 102059
Torricella Sicura TE 20 2641 104700

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km NW of Teramo (54892 inhabitants)
49 Km N of L'Aquila (69753 inhabitants)
62 Km W of Montesilvano (53738 inhabitants)
66 Km E of Foligno (57155 inhabitants)
70 Km NW of Pescara (121014 inhabitants)
73 Km E of Terni (111501 inhabitants)
74 Km NW of Chieti (51815 inhabitants)
92 Km S of Ancona (100861 inhabitants)
96 Km E of Perugia (166134 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 1.1 2021-04-08
22:12:47		 42.7867 13.485 19 2021-04-08
22:19:51		 Sala Sismica INGV-Roma 88922931
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-08 22:12:47 ± 0.08
Latitude 42.7867 ± 0.0036
Longitude 13.4850 ± 0.0049
Depth (km) 19 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88922931

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 404
Semi-minor axis of confidence ellipse (meter) 204
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 53
Circular confidence region, given by single value of horizontal uncertainty (meter) 400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 66
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.07105
Epicentral distance of station farthest from the epicenter (degree) 0.38311
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 88922931
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-08 22:19:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.T1299.HNZ. 2021-04-08T22:12:57.64 0.6 undecidable manual S 224 23.6541 119 0.37 47
IV.MMO1.EHZ. 2021-04-08T22:12:56.05 0.6 undecidable manual S 314 17.9709 128 0.04 51
IV.TERO.HHZ. 2021-04-08T22:12:56.47 0.3 undecidable manual S 152 20.5683 124 -0.11 74
IV.SMA1.EHZ. 2021-04-08T22:12:56.87 1.0 undecidable manual S 215 21.1677 123 0.16 24
IV.FDMO.HHZ. 2021-04-08T22:12:55.77 1.0 negative manual P 311 42.5241 104 -0.28 23
IV.RM33.EHZ. 2021-04-08T22:12:55.40 1.0 undecidable manual P 216 37.9287 106 0.04 24
IV.TRTR.HHE. 2021-04-08T22:12:55.06 0.6 undecidable manual P 86 34.9428 108 0.13 48
IV.MNTT.EHZ. 2021-04-08T22:12:54.63 1.0 undecidable manual P 16 31.8459 110 0.16 24
IV.NRCA.HHZ. 2021-04-08T22:12:54.13 0.1 positive manual P 280 30.6471 111 -0.17 96
IV.MTRA.EHZ. 2021-04-08T22:12:54.28 0.6 undecidable manual S 245 7.881 153 -0.01 51
IV.MF5.EHZ. 2021-04-08T22:12:53.40 0.6 positive manual P 355 22.3554 121 0.24 48
IV.OFFI.HHZ. 2021-04-08T22:12:53.40 1.0 undecidable manual P 45 23.1546 120 0.14 25
IV.MC2.EHZ. 2021-04-08T22:12:53.85 1.0 positive manual P 300 27.75 114 -0.04 25
IV.T1299.HNZ. 2021-04-08T22:12:53.42 0.3 undecidable manual P 224 23.6541 119 0.1 74
IV.MMO1.EHZ. 2021-04-08T22:12:52.43 0.6 undecidable manual P 314 17.9709 128 -0.16 49
IV.TERO.HHZ. 2021-04-08T22:12:52.85 0.1 undecidable manual P 152 20.5683 124 -0.07 100
IV.SMA1.EHZ. 2021-04-08T22:12:52.95 0.6 undecidable manual P 215 21.1677 123 -0.05 50
IV.MTRA.EHZ. 2021-04-08T22:12:51.52 0.6 undecidable manual P 245 7.881 153 -0.08 51
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHN. ML:0.7 0.000047112680000000006 0.32 AML other m 2021-04-08T22:12:59.52
IV.MTRA.EHE. ML:1.2 0.0001234 0.16 AML other m 2021-04-08T22:12:54.50
IV.TERO.HHN. ML:1.2 0.0000896 0.16 AML other m 2021-04-08T22:12:56.84
IV.TERO.HHE. ML:1.1 0.000063043795 0.0768 AML other m 2021-04-08T22:12:56.97
IV.SMA1.EHN. ML:1.3 0.00010478063 0.0896 AML other m 2021-04-08T22:12:57.12
IV.SMA1.EHE. ML:1.2 0.000095254055 0.1664 AML other m 2021-04-08T22:12:57.19
IV.NRCA.HHN. ML:1.8 0.00023391705 0.1664 AML other m 2021-04-08T22:12:59.21
IV.NRCA.HHE. ML:1.5 0.0001225 0.12 AML other m 2021-04-08T22:12:59.80
IV.MTRA.HNE. ML:1.2 0.00014223765000000003 0.1664 AML other m 2021-04-08T22:12:54.50
IV.MTRA.HNN. ML:0.8 0.000053947434999999994 0.6656 AML other m 2021-04-08T22:12:54.51
IV.TERO.HNE. ML:1.2 0.00009443077999999999 0.2176 AML other m 2021-04-08T22:12:58.21
IV.TERO.HNN. ML:1.4 0.00012963464999999998 1.4592 AML other m 2021-04-08T22:12:57.17
IV.MF5.EHE. ML:1.1 0.00006500828 0.2816 AML other m 2021-04-08T22:12:58.04
IV.MF5.EHN. ML:1.1 0.000064436695 0.4608 AML other m 2021-04-08T22:12:57.92
IV.NRCA.HNE. ML:1.5 0.000119064075 0.1536 AML other m 2021-04-08T22:12:59.80
IV.NRCA.HNN. ML:1.8 0.000270362 0.1664 AML other m 2021-04-08T22:12:59.44
IV.RM33.EHE. ML:0.9 0.000023495855 0.1024 AML other m 2021-04-08T22:13:02.10
IV.RM33.EHN. ML:0.6 0.0000141784885 0.2816 AML other m 2021-04-08T22:13:01.65
IV.FDMO.HHE. ML:0.7 0.0000155532585 0.1792 AML other m 2021-04-08T22:13:02.68
IV.FDMO.HHN. ML:0.7 0.000013753110000000001 0.256 AML other m 2021-04-08T22:13:02.28
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