Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 25-05-2013 and time 04:17:31 (Italy) in region 1 km SE Massa Martana (PG)

A magnitude ML 1.5 earthquake occured in region: 1 km SE Massa Martana (PG), on

  • 25-05-2013 02:17:31 (UTC)
  • 25-05-2013 04:17:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7680, 12.5380 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
Massa Martana PG 2 3770 3770
Giano dell'Umbria PG 8 3846 7616
Acquasparta TR 9 4778 12394
Todi PG 11 16851 29245
Castel Ritaldi PG 13 3278 32523
Montecastrilli TR 14 5022 37545
Avigliano Umbro TR 15 2558 40103
Gualdo Cattaneo PG 16 6155 46258
Collazzone PG 16 3473 49731
Spoleto PG 17 38218 87949
Montefalco PG 17 5679 93628
Monte Castello di Vibio PG 17 1567 95195
San Gemini TR 17 5018 100213
Fratta Todina PG 17 1839 102052
Bevagna PG 20 5081 107133

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km NW of Terni (111501 inhabitants)
25 Km SW of Foligno (57155 inhabitants)
40 Km SE of Perugia (166134 inhabitants)
53 Km NE of Viterbo (67173 inhabitants)
84 Km NW of L'Aquila (69753 inhabitants)
87 Km N of Guidonia Montecelio (88673 inhabitants)
92 Km N of Tivoli (56533 inhabitants)
94 Km SE of Arezzo (99543 inhabitants)
96 Km W of Teramo (54892 inhabitants)
97 Km NE of Civitavecchia (52991 inhabitants)
97 Km N 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 1.5 2013-05-25
02:17:31		 42.7678 12.5378 8 2015-01-20
11:26:04		 Bollettino Sismico Italiano INGV 5499421
Reviewed
Rev100 		ML 1.5 2013-05-25
02:17:31		 42.7672 12.5397 8 2014-10-21
12:08:56		 Sala Sismica INGV-Roma 3587621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2013-05-25 02:17:31 ± 0.06
Latitude 42.7678 ± 0.0027
Longitude 12.5378 ± 0.0049
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 5499421

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 435
Semi-minor axis of confidence ellipse (meter) 264
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 252
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 113
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.03957
Epicentral distance of station farthest from the epicenter (degree) 0.69967
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 5499421
Agency INGV
Autore Manually reviewed by Franco Mele
Time of creation (UTC) 2015-01-15 13:27:31

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 3587621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2013-05-25 02:25:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2013-05-25T02:17:52.51 0.6 undecidable manual S 56 64.9905 50 0.59 40
IV.FDMO.HHZ. 2013-05-25T02:17:48.94 0.6 undecidable manual S 56 53.7018 50 0.05 47
IV.LNSS.HHZ. 2013-05-25T02:17:46.95 0.6 undecidable manual S 114 44.9217 50 0.41 44
IV.MGAB.HHZ. 2013-05-25T02:17:45.05 0.6 undecidable manual S 295 38.1285 50 0.3 46
IV.CESI.HHZ. 2013-05-25T02:17:45.22 0.6 undecidable manual S 48 39.7269 50 0.05 48
IV.CAFI.HHZ. 2013-05-25T02:17:45.16 0.3 undecidable manual P 324 77.6667 50 -0.03 68
IV.CSP1.EHZ. 2013-05-25T02:17:43.33 0.1 undecidable manual P 56 64.9905 50 0.09 92
IV.SMA1.EHZ. 2013-05-25T02:17:43.52 0.6 undecidable manual P 103 66.7776 50 0 46
IV.ASSB.HHZ. 2013-05-25T02:17:42.91 0.6 undecidable manual S 18 32.0457 104 0.07 49
IV.FDMO.HHZ. 2013-05-25T02:17:41.30 0.1 undecidable manual P 56 53.7018 50 -0.2 91
IV.ARRO.EHZ. 2013-05-25T02:17:41.55 0.6 undecidable manual S 138 27.9498 106 0.06 49
IV.SACS.HHZ. 2013-05-25T02:17:41.30 1.0 undecidable manual P 280 51.9036 50 0.07 24
IV.NRCA.HHZ. 2013-05-25T02:17:40.35 0.1 negative manual P 81 47.5191 50 -0.19 92
IV.CESI.HHZ. 2013-05-25T02:17:39.22 0.1 undecidable manual P 48 39.7269 50 -0.13 95
IV.LNSS.HHZ. 2013-05-25T02:17:39.72 0.1 undecidable manual P 114 44.9217 50 -0.42 88
IV.CESX.HHZ. 2013-05-25T02:17:38.28 0.6 undecidable manual S 167 18.1707 113 0.03 50
IV.MGAB.HHZ. 2013-05-25T02:17:38.99 0.3 undecidable manual P 295 38.1285 50 -0.12 72
IV.ASSB.HHZ. 2013-05-25T02:17:37.94 0.1 undecidable manual P 18 32.0457 104 -0.06 98
IV.ARRO.EHZ. 2013-05-25T02:17:37.29 0.1 undecidable manual P 138 27.9498 106 0.07 98
IV.CESX.HHZ. 2013-05-25T02:17:35.42 0.1 undecidable manual P 167 18.1707 113 0.06 100
IV.MOMA.HHZ. 2013-05-25T02:17:34.43 0.3 undecidable manual S 34 4.3956 151 -0.1 76
IV.MOMA.HHZ. 2013-05-25T02:17:33.39 0.1 negative manual P 34 4.3956 151 0.18 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHE. ML:1.4 0.00014600000000000003 0.66 AML other m 2013-05-25T02:17:42.97
IV.ARRO.EHN. ML:1.4 0.0001395 0.18 AML other m 2013-05-25T02:17:43.58
IV.ASSB.HHE. ML:1.5 0.0001315 1.34 AML other m 2013-05-25T02:17:43.01
IV.ASSB.HHN. ML:1.5 0.000143 0.14 AML other m 2013-05-25T02:17:44.89
IV.CESI.HHN. ML:1.1 0.0000429 0.24 AML other m 2013-05-25T02:17:46.43
IV.CESI.HHE. ML:0.9 0.000029400000000000003 1.5 AML other m 2013-05-25T02:17:46.90
IV.CESX.HHN. ML:1.7 0.00041049999999999995 0.5 AML other m 2013-05-25T02:17:40.89
IV.CESX.HHE. ML:1.6 0.0003195 0.54 AML other m 2013-05-25T02:17:40.49
IV.FDMO.HHE. ML:1.4 0.0000632 0.76 AML other m 2013-05-25T02:17:50.43
IV.FDMO.HHN. ML:1.3 0.00005255 1.12 AML other m 2013-05-25T02:17:52.68
IV.LNSS.HHN. ML:1.6 0.0001255 1.26 AML other m 2013-05-25T02:17:49.72
IV.LNSS.HHE. ML:1.7 0.0001565 0.96 AML other m 2013-05-25T02:17:49.36
IV.MGAB.HHE. ML:1.6 0.0001365 0.28 AML other m 2013-05-25T02:17:50.77
IV.MGAB.HHN. ML:1.7 0.0001715 1.16 AML other m 2013-05-25T02:17:45.26
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