Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 20-05-2021 and time 23:43:47 (Italy) in region 5 km NW Magliano de' Marsi (AQ)

A magnitude ML 1.1 earthquake occured in region: 5 km NW Magliano de' Marsi (AQ), on

  • 20-05-2021 21:43:47 (UTC)
  • 20-05-2021 23:43:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.1230, 13.3150 at 9 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Magliano de' Marsi AQ 5 3690 3690
Massa d'Albe AQ 7 1476 5166
Scurcola Marsicana AQ 7 2824 7990
Tagliacozzo AQ 8 6889 14879
Sante Marie AQ 9 1166 16045
Borgorose RI 10 4591 20636
Cappadocia AQ 13 528 21164
Avezzano AQ 14 42515 63679
Castellafiume AQ 15 1106 64785
Pescorocchiano RI 17 2075 66860
Ovindoli AQ 17 1227 68087
Capistrello AQ 19 5252 73339
Tornimparte AQ 19 3187 76526
Pereto AQ 19 682 77208
Lucoli AQ 19 1011 78219
Rocca di Cambio AQ 19 533 78752
Carsoli AQ 19 5396 84148
Rocca di Mezzo AQ 19 1526 85674
Celano AQ 20 11017 96691

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km S of L'Aquila (69753 inhabitants)
46 Km E of Tivoli (56533 inhabitants)
50 Km E of Guidonia Montecelio (88673 inhabitants)
66 Km NE of Velletri (53303 inhabitants)
68 Km SW of Teramo (54892 inhabitants)
73 Km E of Roma (2864731 inhabitants)
73 Km SE of Terni (111501 inhabitants)
75 Km W of Chieti (51815 inhabitants)
80 Km NE of Latina (125985 inhabitants)
81 Km NE of Aprilia (73446 inhabitants)
81 Km SW of Montesilvano (53738 inhabitants)
83 Km W of Pescara (121014 inhabitants)
84 Km NE of Pomezia (62966 inhabitants)
94 Km NE of Anzio (54211 inhabitants)
97 Km E of Fiumicino (78395 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 2021-05-20
21:43:47		 42.1233 13.3147 9 2021-12-29
11:12:16		 Bollettino Sismico Italiano INGV 93580741
Reviewed
Rev100 		ML 1.1 2021-05-20
21:43:47		 42.1215 13.3232 13 2021-05-20
21:50:59		 Sala Sismica INGV-Roma 90307581
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-20 21:43:47 ± 0.1
Latitude 42.1233 ± 0.0045
Longitude 13.3147 ± 0.0085
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 93580741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 596
Semi-minor axis of confidence ellipse (meter) 438
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 80
Circular confidence region, given by single value of horizontal uncertainty (meter) 600.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.39210
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 93580741
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-08-02 23:17:39

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 90307581
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-20 21:50:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MBAL.EHZ. 2021-05-20T21:45:18.64 3.0 undecidable manual Sg 12.68 0
IV.MMGO.HHZ. 2021-05-20T21:45:03.65 3.0 negative manual Pg 21.440001 0
IV.PAOL.HHZ. 2021-05-20T21:45:01.51 3.0 undecidable manual Sg 10.75 0
MN.TRI.HHZ. 2021-05-20T21:44:38.19 3.0 undecidable manual Pg 8.74 0
IV.CRTC.HHZ. 2021-05-20T21:44:28.91 3.0 undecidable manual Sg -3.34 0
IV.MPPT.EHZ. 2021-05-20T21:44:27.71 3.0 undecidable manual Sn -0.89 0
IV.FIR.HHZ. 2021-05-20T21:44:14.37 3.0 undecidable manual Sn -9.99 0
IV.CRE.HHZ. 2021-05-20T21:44:14.36 3.0 undecidable manual Sn -9.28 0
IV.PAOL.HHZ. 2021-05-20T21:44:12.02 3.0 undecidable manual Pn -3.48 0
IV.PTRJ.HHZ. 2021-05-20T21:44:11.98 3.0 undecidable manual Pg -1.43 0
IV.RM33.HNE. 2021-05-20T21:44:02.84 0.6 undecidable manual S 349 43.5231 50 0.87 37
IV.GIGS.HHN. 2021-05-20T21:44:01.38 0.6 undecidable manual S 30 42.3243 50 -0.25 45
IV.GUAR.HNN. 2021-05-20T21:44:00.90 0.6 undecidable manual S 180 36.4413 50 0.81 38
IV.CERT.HHZ. 2021-05-20T21:43:58.89 0.3 undecidable manual S 235 33.5442 50 -0.42 67
IV.RSM2.HHZ. 2021-05-20T21:43:57.87 3.0 negative manual Pn -6.93 0
IV.FAGN.HHZ. 2021-05-20T21:43:57.20 0.6 undecidable manual S 54 27.1506 109 -0.21 47
MN.AQU.HNN. 2021-05-20T21:43:57.36 0.6 undecidable manual S 16 26.6511 109 0.12 48
IV.T0110.HHZ. 2021-05-20T21:43:55.09 0.3 undecidable manual P 73 39.7269 50 -0.16 70
IV.FIAM.HHZ. 2021-05-20T21:43:55.97 0.3 undecidable manual S 315 22.8549 112 -0.03 74
IV.RM33.HNE. 2021-05-20T21:43:55.60 0.3 undecidable manual P 349 43.5231 50 -0.24 68
IV.GUAR.HNN. 2021-05-20T21:43:55.48 0.3 undecidable manual P 180 36.4413 50 0.73 60
IV.GIGS.HHN. 2021-05-20T21:43:55.43 0.6 undecidable manual P 30 42.3243 50 -0.21 46
IV.VVLD.HHZ. 2021-05-20T21:43:54.58 0.3 undecidable manual P 138 37.9287 50 -0.4 67
IV.CERT.HHZ. 2021-05-20T21:43:54.01 0.3 undecidable manual P 235 33.5442 50 -0.29 69
IV.RMP.HHZ. 2021-05-20T21:43:53.92 3.0 positive manual P -3.92 0
MN.AQU.HNN. 2021-05-20T21:43:53.54 0.3 undecidable manual P 16 26.6511 109 0.44 67
IV.PTQR.HHZ. 2021-05-20T21:43:53.01 0.3 undecidable manual S 148 13.2756 125 -0.05 75
IV.FAGN.HHZ. 2021-05-20T21:43:53.13 0.3 undecidable manual P 54 27.1506 109 -0.07 73
IV.FIAM.HHZ. 2021-05-20T21:43:52.34 0.3 undecidable manual P 315 22.8549 112 -0.04 74
IV.TOLF.HHZ. 2021-05-20T21:43:50.82 3.0 undecidable manual Pn -2.93 0
IV.PTQR.HHZ. 2021-05-20T21:43:50.72 0.1 undecidable manual P 148 13.2756 125 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PTQR.HHN. ML:0.9 0.00008664064 0.1152 AML other m 2021-05-20T21:43:53.66
IV.PTQR.HHE. ML:0.8 0.00007642384999999999 0.3072 AML other m 2021-05-20T21:43:55.54
IV.CERT.HHE. ML:1.1 0.000051500000000000005 0.32 AML other m 2021-05-20T21:43:59.44
IV.CERT.HHN. ML:1.3 0.00007925 0.26 AML other m 2021-05-20T21:43:59.69
IV.FIAM.HHN. ML:0.8 0.000037501124999999994 0.4608 AML other m 2021-05-20T21:44:01.95
IV.FAGN.HHN. ML:1.4 0.00015189979999999996 0.4608 AML other m 2021-05-20T21:44:02.26
IV.T0110.HHN. ML:1.2 0.0000559763 1.7568 AML other m 2021-05-20T21:44:03.91
IV.FAGN.HHE. ML:1.6 0.0002060477 0.3456 AML other m 2021-05-20T21:44:03.03
IV.FIAM.HHE. ML:0.8 0.000045357055000000003 0.4736 AML other m 2021-05-20T21:44:03.48
IV.T0110.HHE. ML:1.3 0.00006410893000000001 0.32 AML other m 2021-05-20T21:44:06.80
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