Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 16-04-2021 and time 08:31:22 (Italy) in region 5 km SE Cittareale (RI)

A magnitude ML 1.1 earthquake occured in region: 5 km SE Cittareale (RI), on

  • 16-04-2021 06:31:22 (UTC)
  • 16-04-2021 08:31:22 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.5960, 13.2110 at 15 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
Cittareale RI 5 482 482
Amatrice RI 8 2657 3139
Montereale AQ 8 2581 5720
Borbona RI 11 617 6337
Capitignano AQ 11 665 7002
Accumoli RI 12 667 7669
Posta RI 12 694 8363
Campotosto AQ 14 542 8905
Cagnano Amiterno AQ 15 1369 10274
Barete AQ 17 737 11011
Pizzoli AQ 19 4326 15337

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km NW of L'Aquila (69753 inhabitants)
41 Km W of Teramo (54892 inhabitants)
46 Km E of Terni (111501 inhabitants)
58 Km SE of Foligno (57155 inhabitants)
77 Km NE of Guidonia Montecelio (88673 inhabitants)
78 Km W of Montesilvano (53738 inhabitants)
78 Km NE of Tivoli (56533 inhabitants)
83 Km W of Chieti (51815 inhabitants)
84 Km W of Pescara (121014 inhabitants)
88 Km SE of Perugia (166134 inhabitants)
93 Km E of Viterbo (67173 inhabitants)
98 Km NE of Roma (2864731 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 1.1 2021-04-16
06:31:22		 42.5962 13.2108 15 2021-07-12
16:55:07		 Bollettino Sismico Italiano INGV 89335671
Reviewed
Rev100 		ML 1.1 2021-04-16
06:31:22		 42.5955 13.2168 14 2021-04-16
06:40:57		 Sala Sismica INGV-Roma 89135521
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-16 06:31:22 ± 0.11
Latitude 42.5962 ± 0.0045
Longitude 13.2108 ± 0.0061
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89335671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 525
Semi-minor axis of confidence ellipse (meter) 381
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 135
Circular confidence region, given by single value of horizontal uncertainty (meter) 520.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 124
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31566
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 89335671
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-21 17:11:52

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 89135521
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-16 06:40:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
AC.KBN.HHZ. 2021-04-16T06:32:51.02 3.0 negative manual Pg 22.74 0
IV.AGLI.HHZ. 2021-04-16T06:32:47.62 3.0 undecidable manual Sn -1.74 0
IV.GIZZ.HHZ. 2021-04-16T06:32:44.01 3.0 undecidable manual Sn -6.49 0
IV.HAGA.HHZ. 2021-04-16T06:32:36.05 3.0 positive manual Pg 11.67 0
IV.CORL.HHZ. 2021-04-16T06:32:35.03 3.0 negative manual Pg 19.77 0
IV.MTGR.HHZ. 2021-04-16T06:32:32.94 3.0 undecidable manual Pg 16.82 0
AC.VLO.HHZ. 2021-04-16T06:32:16.14 3.0 undecidable manual Pn -0.67 0
IV.PE3.EHZ. 2021-04-16T06:31:59.47 3.0 undecidable manual Sn -1.47 0
IV.RIBO.EHZ.01 2021-04-16T06:31:53.59 3.0 undecidable manual Pg 8.98 0
IV.BRSN.HNZ. 2021-04-16T06:31:47.81 3.0 undecidable manual Pn 1.38 0
IV.CRTC.HHZ. 2021-04-16T06:31:39.74 3.0 positive manual Pn 2.75 0
IV.IFOR.HHZ. 2021-04-16T06:31:39.99 3.0 undecidable manual Pn 2.18 0
IV.NRCA.HHZ. 2021-04-16T06:31:32.70 0.6 undecidable manual S 343 27.4503 106 -0.03 48
IV.MTRA.HNE. 2021-04-16T06:31:31.50 0.3 undecidable manual S 40 23.3544 110 -0.19 71
IV.MMO1.EHN. 2021-04-16T06:31:29.56 0.1 undecidable manual P 16 34.9428 101 -0.08 94
IV.CAMP.HHZ. 2021-04-16T06:31:29.28 3.0 undecidable manual S 0
IV.ARRO.EHZ. 2021-04-16T06:31:29.75 3.0 positive manual P 0.76 0
IV.MC2.EHZ. 2021-04-16T06:31:29.77 0.1 undecidable manual P 357 35.0427 101 0.12 95
IV.LNSS.HHZ. 2021-04-16T06:31:29.50 0.6 undecidable manual S 273 13.9749 128 0.03 50
IV.RM33.EHZ. 2021-04-16T06:31:28.30 0.6 undecidable manual S 178 9.6792 141 -0.35 47
IV.NRCA.HHZ. 2021-04-16T06:31:28.49 0.1 undecidable manual P 343 27.4503 106 -0.03 97
IV.GAVE.EHN. 2021-04-16T06:31:28.56 0.1 undecidable manual P 293 27.9498 105 -0.03 96
IV.T1299.EHZ. 2021-04-16T06:31:28.40 0.1 undecidable manual S 54 7.1928 150 0.13 97
IV.MTRA.HNE. 2021-04-16T06:31:27.95 0.1 undecidable manual P 40 23.3544 110 0.03 98
IV.MIDA.HHZ. 2021-04-16T06:31:27.42 3.0 undecidable manual P -0.56 0
IV.RM33.EHZ. 2021-04-16T06:31:26.14 0.1 undecidable manual P 178 9.6792 141 -0.03 100
IV.T1299.EHZ. 2021-04-16T06:31:26.15 0.1 undecidable manual P 54 7.1928 150 0.2 97
IV.LNSS.HHZ. 2021-04-16T06:31:26.63 1.0 undecidable manual P 273 13.9749 128 -0.01 25
IV.CAMP.HHZ. 2021-04-16T06:31:24.22 3.0 undecidable manual P 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHN. ML:1.2 0.0001525 0.28 AML other m 2021-04-16T06:31:28.42
IV.RM33.EHE. ML:1.0 0.00009470000000000001 0.3 AML other m 2021-04-16T06:31:28.65
IV.LNSS.HHE. ML:1.1 0.00010115 0.12 AML other m 2021-04-16T06:31:29.60
IV.LNSS.HHN. ML:0.8 0.00005625 0.76 AML other m 2021-04-16T06:31:30.21
IV.NRCA.HHN. ML:1.0 0.000046949999999999996 0.8 AML other m 2021-04-16T06:31:32.48
IV.NRCA.HHE. ML:1.4 0.000117 0.1 AML other m 2021-04-16T06:31:32.98
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