Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 02-07-1988 and time 02:11:00 (Italy) in region 2 km S Massa Martana (PG)

A magnitude Md 2.5 earthquake occured in region: 2 km S Massa Martana (PG), on

  • 02-07-1988 00:11:00 (UTC)
  • 02-07-1988 02:11:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7570, 12.5210 at 5 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
Acquasparta TR 8 4778 8548
Todi PG 10 16851 25399
Giano dell'Umbria PG 10 3846 29245
Montecastrilli TR 12 5022 34267
Avigliano Umbro TR 14 2558 36825
Castel Ritaldi PG 15 3278 40103
San Gemini TR 16 5018 45121
Monte Castello di Vibio PG 17 1567 46688
Collazzone PG 17 3473 50161
Fratta Todina PG 17 1839 52000
Gualdo Cattaneo PG 17 6155 58155
Spoleto PG 18 38218 96373
Montefalco PG 19 5679 102052

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km NW of Terni (111501 inhabitants)
27 Km SW of Foligno (57155 inhabitants)
40 Km S of Perugia (166134 inhabitants)
51 Km NE of Viterbo (67173 inhabitants)
85 Km NW of L'Aquila (69753 inhabitants)
86 Km N of Guidonia Montecelio (88673 inhabitants)
91 Km N of Tivoli (56533 inhabitants)
94 Km SE of Arezzo (99543 inhabitants)
95 Km NE of Civitavecchia (52991 inhabitants)
96 Km N of Roma (2864731 inhabitants)
97 Km W of Teramo (54892 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 		Md 2.5
ML-VAX 1.7 		1988-07-02
00:11:00		 42.757 12.521 5 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 72679
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1988-07-02 00:11:00 ± 0.203
Latitude 42.7570 ± 0.0086
Longitude 12.5210 ± 0.0163
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 72679

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 1639.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 172
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) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00283
Epicentral distance of station farthest from the epicenter (degree) 0.01271
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 72679
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:08:44

ML:1.7

Field Value
Value 1.7
Uncertainty
Num. used stations 4
Type of magnitude ML
Reference to an origin 72679
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.SFI.Z. 1988-07-02T00:11:43.00 10.0 undecidable manual SN 337 1.2432 0.78 0.5
--.CRE.Z. 1988-07-02T00:11:34.00 10.0 undecidable manual SG 334 0.9546 -0.33 0.5
--.ALP.Z. 1988-07-02T00:11:28.43 10.0 undecidable manual SG 88 0.7659 0.18 1.1
--.ARV.Z. 1988-07-02T00:11:28.49 10.0 undecidable manual SG 22 0.7992 -0.89 0.2
--.SDI.Z. 1988-07-02T00:11:26.79 10.0 undecidable manual PN 137 1.4097 -0.23 1.3
--.SFI.Z. 1988-07-02T00:11:25.60 10.0 undecidable manual PN 337 1.2432 0.91 0.5
--.CM8.Z. 1988-07-02T00:11:23.75 10.0 undecidable manual SG 46 0.6327 -0.12 1.2
--.SS8.Z. 1988-07-02T00:11:21.83 10.0 undecidable manual SG 64 0.5772 -0.27 0.8
--.CRE.Z. 1988-07-02T00:11:20.00 10.0 undecidable manual PG 334 0.9546 -0.13 1.7
--.AQU.Z. 1988-07-02T00:11:17.00 10.0 undecidable manual PG 121 0.7548 0.45 1.5
--.ARV.Z. 1988-07-02T00:11:16.29 10.0 undecidable manual PG 22 0.7992 -0.99 0.4
--.ALP.Z. 1988-07-02T00:11:16.46 10.0 undecidable manual PG 88 0.7659 -0.16 2
--.MNS.Z. 1988-07-02T00:11:15.13 10.0 undecidable manual SG 162 0.3885 -0.74 0.3
--.CM8.Z. 1988-07-02T00:11:14.89 10.0 undecidable manual PG 46 0.6327 0.79 0.8
--.SS8.Z. 1988-07-02T00:11:13.85 10.0 undecidable manual PG 64 0.5772 0.78 0.8
--.ASS.Z. 1988-07-02T00:11:12.48 10.0 undecidable manual SG 17 0.3108 -0.7 0.4
--.MNS.Z. 1988-07-02T00:11:09.22 10.0 undecidable manual PG 162 0.3885 -0.26 1.8
--.ASS.Z. 1988-07-02T00:11:07.83 10.0 undecidable manual PG 17 0.3108 -0.09 2
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