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³±±±±±±±±±±±±±±± California Division of Mines & Geology ONLINE ±±±±±±±±±±±±±±±³
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  DISCLAIMER -- THIS IS NOT AN EARTHQUAKE PREDICTION OR WARNING!      
                                                                      
  The commentary provided with these map(s) is for INFORMATIONAL      
  USE ONLY, and SHOULD NOT be construed as an earthquake prediction,  
  warning, or advisory.  Responsibility for such warnings rests with  
  the Office of Emergency Services of the State of California.        
                                                                      

            PLEASE REMEMBER -- THIS IS PRELIMINARY DATA

Releasing these summaries on a timely basis requires that the
data, analysis, and interpretations presented are PRELIMINARY. Of
necessity they can only reflect the views of the seismologists who
prepared them, and DO NOT carry the endorsement of the U.S.G.S.
Thus while every effort is made to ensure that the information is
accurate, nothing contained in this report is to be construed as
and earthquake prediction, warning, advisory, or official policy
statement of any kind, of the U.S. Geological Survey, or the
U.S. Government.

                       FOR QUESTIONS CONCERNING THIS REPORT
                    Send e-mail to michael@andreas.wr.usgs.gov


                    Seismicity Report for Northern California,
                     the Nation, and the World for the week of
                               March 9 - 14, 1995

                            Data and text prepared by
                         Steve Walter and Barry Hirshorn
                              U.S. Geological Survey
               345 Middlefield Rd.  MS-977, Menlo Park, CA  94025
                            Graphics by Quentin Lindh


        NOTE:  This report is being written one day early and covers
               the six-day period from March 9 through March 14 (actually
               through 1:00am on March 15 in order to include the M3.1
               event on the Hayward).

San Francisco Bay Area

   During the six-day period ending at midnight on Tuesday, March 14 1995
the U.S. Geological Survey office in Menlo Park recorded 19 earthquakes of
magnitude one (M1) and greater within the San Francisco Bay area shown in
Figure 1.  Five of these were as large as M2.0 including a M3 on the
Hayward fault that was felt in the North Bay.  This total compares to 26
earthquakes during the previous seven-day period (March 2 - 8) four of
which were as large as M2.
   The Hayward earthquake occurred just after midnight early Wednesday
morning (#6 in figure 1).  The preliminary epicenter of the quake was
located in El Cerrito, just west of the Hayward fault.  This section of
the Hayward fault has produced over half a dozen M3+ earthquakes in the
past 25 years.  The most recent example was also the largest:  a M4.1 on
June 26, 1994.
   Other M2 earthquakes were all located in the South Bay, similar to last
week.  The central Calaveras experienced two M2.1 events Monday morning.
The first of these occurred eleven miles north of Morgan Hill (#3/1); the
second about six miles northeast of Gilroy (#4/1). The creeping segment of
the San Andreas also experienced a M2.1 earthquake that was located about
six miles northwest of San Juan Bautista (#5/1).  The Quien Sabe fault
also produced a M2.3 earthquake, the first M2 event since a pair of M2.4's
occurred here in early November, 1994.

Northern & Central California

   The rest of northern & central California was very quiet during the
past six days.  The Cape Mendocino fracture zone, site of numerous M2's,
3's, and 4's during the past several weeks, experienced only earthquake as
large as M2 (#2/2).  The northern Coast Range, in addition to four M2's at
the Geysers, experienced just one M2 earthquake:  a M2.2 on the Bartlett
Springs fault about 20 miles northeast of Willits (#4/2).  The northern
Sierra saw two M2 events in the Markleeville area,  aftershocks to a M6.0
last September (#5/2), and a M2.3 eleven miles northeast of Quincy (#1/2).
Central California was equally quiet with just a couple M2's on the
creeping San Andreas, a M2.3 in the Ciervo Hills 30 miles northwest of
Coalinga (#6/2), and a M2.0 off the coast about 22 miles northwest of San
Simeon (#3/2).

Long Valley Caldera

    There were two M2 earthquakes last Thursday beneath the south rim of
the caldera (#1/3), both aftershocks to a M4.4 on March 4.  Neither was
reported to have been felt.  The only activity south of the caldera was a
M2.7 last Thursday evening southeast of Mt. Morrison (#2/3).

USA Seismicity (March 6 - 14)

   According to data provided by the National Earthquake Information
Center, there were several domestic earthquakes of note outside of
California.  Eastern Kentucky of all places produced a pair of M3
earthquakes early last Saturday morning (#3/4). The largest had a
magnitude of 3.8.  Both occurred near Kentucky's historic city of
Cumberland and were likely felt by local residents.
   Several of the western states were seismically active.  A M3.1 occurred
north of the Grand Canyon in northwestern Arizona (#1/4).  Eastern Nevada
saw a M3.3 south of Ely (#4/4).  Western Oregon experienced a M2.7 that
was felt in the small mountain town of Sweet Home (#5/4).  Southern
California was quiet during the week; the only event of note was a M3.0
last Wednesday that was felt in the northern San Fernando Valley (#2/4).
   Two domestic earthquakes of note occurred outside the conterminous U.S.
Last Thursday a M3.9 occurred on the island of Hawaii that was felt at
Glenwood.  On Tuesday a M5.9 occurred offshore the Alaskan Peninsula about
50 miles southwest of Sand Point (#6/5).  This earthquake was felt
strongly at Sand Point, Cold Bay, King Cove, and Perryville but there were
no initial reports of any damage.

The Planet Earth  (March 6 - 14)

   The largest earthquake on the planet was the Ms5.9 off southern Alaska,
discussed above (#6/5).  Only slightly smaller were a Ms5.8 in the Irian
Jaya region of Indonesia (#5/5) and an Mb5.9 east of the Kuril Islands
(#3/5).   Smaller earthquakes worth noting include a Mb5.5 in the eastern
Pacific plate (#2/5) and a Mb5.3 west of the Svalbard Islands in the
Arctic Ocean (#1/5).

Table 1. Northern & Central California Seismicity (M>1.0)

--ORIGIN TIME (UT)-- -LAT N-- --LON W-- DEPTH  N N RMS ERH ERZ       DUR
YR MON DA HRMN  SEC  DEG MIN  DEG  MIN    KM  RD S SEC  KM  KM REMKS MAG

95 MAR  9 1219  9.43 37 36.05 118 50.28 11.36 29 2 .13  .4  .5 SMO   2.0
95 MAR  9 1225 48.98 39 59.98 120 44.57  8.77 14 1 .19 1.313.4 WAK-  2.2
95 MAR  9 1235  1.73 37 35.97 118 50.19 11.44 29 1 .12  .4  .6 MOR   2.1
95 MAR  9 1305 41.76 40 17.19 124 17.67  9.26  8 1 .06  .4 1.0 MEN   2.1
95 MAR  9 1659 13.79 35 45.79 121 33.75  0.02  7 1 .13 3.0 1.4 SSM * 1.9

95 MAR 10  204 30.88 36 49.55 121 16.95  7.30 57   .13  .3  .5 QUI   2.4
95 MAR 10  221 33.07 37 57.39 122  3.40 15.23 15   .16  .9 1.2 CON   1.4
95 MAR 10  304  1.96 37 29.18 118 48.48 11.15 28   .10  .4  .9 MOR   2.8
95 MAR 10  357 24.82 37 29.15 118 59.86  2.01 14   .17 1.013.2 SIL - 1.5
95 MAR 10  418 14.16 38 47.14 122 46.15  2.68 15   .10  .3 1.4 GEY   1.9

95 MAR 10  550 45.51 36 36.97 121 13.37  6.38 37   .13  .3  .7 PIN   2.3
95 MAR 10  555  9.05 39 36.92 123  3.85  0.17 21 3 .13  .3 1.9 BAR   2.1
95 MAR 10  623 21.82 36 52.19 121 35.57  4.98 15   .07  .3  .5 SJB   1.4
95 MAR 10  740 14.10 38 56.18 122 37.78  4.46 12   .09  .4  .8 KON   1.7
95 MAR 10  751 43.50 37 26.72 118 42.65  8.33  9   .04 1.3 4.8 WCS   1.2

95 MAR 10  837 24.38 37 37.07 118 48.91  7.04  8 1 .11 2.3 1.6 HCF   1.1
95 MAR 10  903 39.44 37 54.50 121 58.56 13.49 13   .10  .5 1.0 CON   1.3
95 MAR 10  904  9.19 38 48.34 122 46.10  0.27 10   .03  .2 1.1 GEY   1.7
95 MAR 10  949 14.08 38 47.82 122 44.67  0.03 11   .08  .3 1.4 GEY * 1.9
95 MAR 10 1012  5.38 38 49.49 122 48.01  5.68 15   .10  .3 1.1 GEY   2.0

95 MAR 10 1200 41.13 37 37.73 118 58.10  9.73 15   .07  .5 1.1 SMO   1.3
95 MAR 10 1258 14.29 37 12.66 121 31.09  9.84  7   .16 3.0 2.3 HAM   1.1
95 MAR 10 1334 28.75 37 36.13 118 49.70 11.23 12   .10  .6 1.0 SMO   1.3
95 MAR 10 1409 41.41 37 34.92 118 47.15 14.70  9 1 .05 2.2 1.2 MOR   1.2
95 MAR 10 1637 44.19 37 38.72 118 54.57  0.87  9   .04  .3  .4 SMO   1.2

95 MAR 10 1643 45.23 38 47.59 122 44.32  2.85 18   .08  .2  .8 GEY   2.4
95 MAR 10 1651 56.27 38 47.78 122 44.40  1.30 11   .06  .3  .9 GEY   1.8
95 MAR 10 1653 21.04 38 47.78 122 43.73  3.13  9   .06  .5 1.3 GEY   1.5
95 MAR 10 1726 35.20 38 47.43 122 45.43  1.54  7   .03  .4 1.5 GEY   1.6
95 MAR 10 2206 30.87 37 35.94 118 50.21 12.07 14   .08  .6  .7 MOR   1.9

95 MAR 11  414 13.66 37  9.04 121 33.39  6.15 10 1 .08  .8  .9 CYN   1.2
95 MAR 11  438 26.54 38 50.20 122 49.12  0.89  8   .05  .3 1.3 GEY   1.4
95 MAR 11  522 52.24 37 34.23 118 50.92  7.72 10 1 .05  .5  .8 MOR   1.1
95 MAR 11  926 29.29 36 44.91 121  0.57  6.47 20 2 .10  .3 2.4 ORT   1.4
95 MAR 11 1012 48.72 37 22.23 121 43.63  9.08 16 2 .05  .3  .6 ALU   1.1

95 MAR 11 1112 22.25 37 36.18 118 27.73  7.00 14 1 .05  .3  .9 CHV   1.0
95 MAR 11 1503 30.04 37 38.63 118 55.77  7.37 13 2 .05  .5  .4 SMO   1.6
95 MAR 11 1543 28.04 35 48.85 120 22.08  8.73 23 1 .10  .3  .5 GOL   1.7
95 MAR 11 1550 24.58 37 35.17 119  0.59  4.67 11   .04  .5 1.2 SIL   1.1
95 MAR 11 1627  5.66 38 46.88 122 45.79  1.87  7   .03  .4 1.4 GEY   1.1

95 MAR 11 1633 25.09 38 50.00 122 49.50  0.11  8   .17  .6 4.3 GEY * 1.2
95 MAR 11 1720 26.68 38 48.44 122 45.81  5.17 15   .15  .4 1.1 GEY   2.1
95 MAR 12  150 19.17 36 37.21 121 13.33  4.78 29 1 .06  .2  .6 PIN   1.6
95 MAR 12  214 16.44 37 36.21 118 50.68 12.42  8   .09  .7  .9 SMO   1.0
95 MAR 12  241 27.66 38 48.62 122 48.89  3.55  7   .03  .4 2.3 GEY   1.2

--ORIGIN TIME (UT)-- -LAT N-- --LON W-- DEPTH  N N RMS ERH ERZ       DUR
YR MON DA HRMN  SEC  DEG MIN  DEG  MIN    KM  RD S SEC  KM  KM REMKS MAG

95 MAR 12  432 26.47 36 45.33 121 15.79  9.73 19   .05  .3  .6 PAI   1.4
95 MAR 12 1231 35.46 36 34.07 121  3.86  9.26 48 1 .13  .3  .6 BVL   2.3
95 MAR 12 1257  6.55 36 49.05 121 32.37  5.67 29   .14  .3  .6 SJB   1.4
95 MAR 12 1339 38.11 38 49.41 122 48.01  1.58  9   .07  .3 1.4 GEY   1.4
95 MAR 12 1352 47.03 36 33.46 121  4.40  9.17 11 1 .05  .5  .9 BVL   1.2

95 MAR 12 1431 18.12 41 18.53 124  1.19 30.07  8 2 .08 1.9 1.7 DEL   1.9
95 MAR 12 1608 17.67 36 23.73 120 59.18  6.30 17 2 .11  .5 1.8 BIT-  1.4
95 MAR 12 1615 46.22 37 26.63 121 46.66  7.94 20 1 .05  .2  .4 ALU   1.3
95 MAR 12 1819 23.64 38 48.17 119 42.56  0.12 25 3 .09  .6 1.1 WAK   2.4
95 MAR 13  222 12.91 37  8.23 121 31.92  8.12 16   .04  .3  .7 CYN   1.4

95 MAR 13  347 52.65 38 41.64 122  8.78 18.40  7 1 .03 1.2  .6 SAC   1.7
95 MAR 13  404  9.62 37 54.52 121 59.74 10.06 21 3 .11  .4  .6 CON   1.7
95 MAR 13  612 23.76 38 47.21 122 45.26  3.13 18 1 .13  .3 1.1 GEY   1.9
95 MAR 13  930 47.74 38 47.71 122 48.13  1.92  7   .11  .4 2.1 GEY   1.2
95 MAR 13 1408 31.16 37 17.33 121 40.24  1.82 39 2 .05  .2  .5 SFL   2.1

95 MAR 13 1522 25.03 38 47.45 122 44.34  3.02 19   .09  .2  .7 GEY   2.2
95 MAR 13 1541  9.62 37  3.42 121 29.15  8.61 59   .10  .2  .4 CYS   2.1
95 MAR 13 1620 42.63 38 45.72 119 43.32  1.75  8 1 .05 1.3 7.2 WAK - 2.0
95 MAR 13 1720 38.98 36 34.13 121  4.01  8.50 36   .17  .4  .7 BVL   1.9
95 MAR 13 1749 41.17 36 33.68 121  4.48  8.28 13 1 .04  .6  .8 BVL   1.2

95 MAR 13 1750 23.47 36 33.95 121  4.10  9.53 12 3 .08  .5  .8 BVL   1.2
95 MAR 13 1858 36.14 38 48.44 122 46.43  1.13  7   .05  .3 1.9 GEY   1.1
95 MAR 13 1921  3.95 37 13.91 118 19.44 10.99 13 2 .08 1.5  .9 OWV   1.4
95 MAR 13 2038  1.06 37 36.53 119 25.07  6.82 12   .19 1.015.3 KAI - 1.2
95 MAR 13 2117 18.84 38 48.77 122 45.47 13.60  9   .21 1.2 1.5 GEY   1.3

95 MAR 13 2150 10.16 36  9.24 120 16.46 10.29 16 1 .15  .7 1.2 COA   1.5
95 MAR 13 2159 43.19 37 14.94 122  0.76  5.51 13 1 .09  .6  .7 BLM   1.1
95 MAR 13 2242 49.34 38 23.94 122 38.04  1.52  9   .17  .7 1.2 ROG   1.3
95 MAR 13 2347 51.93 36 33.98 121  8.87  8.18 12 3 .06  .4  .6 PIN   1.3
95 MAR 14  307  2.15 38 51.41 122 49.64  0.12  8   .11  .4 2.4 GEY * 1.2

95 MAR 14  309  5.62 38 51.21 122 49.44  0.02 11   .10  .3 1.4 GEY * 1.8
95 MAR 14 1106 41.47 36 34.06 121  7.43  8.38 16   .10  .4  .8 PIN   1.2
95 MAR 14 1119 28.85 38 46.32 122 54.41  6.60 19 3 .14  .4  .7 GEY   1.4
95 MAR 14 1120 25.91 38 47.19 122 46.61  3.16  7   .02  .4 2.3 GEY   1.1
95 MAR 14 1417 12.09 37 27.83 121 48.51  6.57 29 1 .09  .2  .4 ALU   1.6

95 MAR 14 1743 12.13 35 55.74 120 28.44  4.99  9   .02  .7  .6 MID   1.4
95 MAR 14 2112 28.99 38 49.51 122 47.69  4.08 15   .05  .3 1.1 GEY   1.9
95 MAR 14 2139  2.71 36 53.95 121 37.22  0.12  8   .05  .3  .9 SJB * 2.1
95 MAR 14 2156 40.48 38 34.89 122 40.14  1.29  8   .06  .3 1.4 NAP   1.7
95 MAR 14 2252  0.41 36 34.33 121  9.75  2.66 17   .09  .4  .5 PIN   1.8

95 MAR 14 2331 53.13 36 58.73 121 37.16  1.68 25   .18  .4 1.9 SAR   1.5
95 MAR 15  403 32.81 36 33.06 120 33.24  2.30 52   .26  .4 2.0 PIN   2.6
95 MAR 15  612 28.70 38 47.00 122 45.28  1.49 14   .05  .2  .7 GEY   1.9
95 MAR 15  634  2.04 38 32.84 122 38.97  5.46 13   .08  .3  .7 NAP   1.6
95 MAR 15  822 58.83 37 55.46 122 17.70  5.03 44   .13  .2  .5 HAY   3.1


TABLE 2.
Data from National Earthquake Information Center (NEIC)

UTC TIME    LAT     LONG    DEP GS MAGS  SD STA  REGION AND COMMENTS
HRMNSEC                         MB  Msz     USED
------------------------------------------------------------------------------
MAR 06
020209.1? 45.00 N 138.66 E  33N 4.3     1.3   7 EASTERN SEA OF JAPAN
033914.4% 11.173N  61.873W  33N         1.0   6 WINDWARD ISLANDS. MD 3.5
041810.2& 60.060N 152.780W 111               60 SOUTHERN ALASKA.
073854.1% 32.669S  70.129W 120G         0.3  11 CHILE-ARGENTINA BORDER. MD 2.6
090117.8? 53.80 N 160.12 E 150G 4.4     0.6  19 NEAR EAST COAST OF KAMCHATKA
100214.1% 32.620S  71.558W  10G         0.4   9 NEAR COAST-CENTRAL CHILE. MD 3.
104858.8* 51.533N 176.712E  33N 4.0     0.9  12 RAT ISLANDS, ALEUTIAN ISLANDS
203221.4* 31.991S  69.998W 100?         0.9  13 SAN JUAN PROVINCE, ARGENTINA
220917.1* 33.446S  69.136W   5G         1.0  11 CHILE-ARGENTINA BORDER. MD 3.3

MAR 07
064741.4& 62.730N 149.660W  83               82 CENTRAL ALASKA. <AEIC>. Felt
                                                (III) at Sheep Creek.
065355.4? 31.85 S  70.13 W 120G         0.8  10 CHILE-ARGENTINA BORDER. MD 2.9
183813.6  43.170N 140.699E 174* 4.6     0.7  45 HOKKAIDO, JAPAN  REGION
223319.3  36.616N 113.467W   5G         1.1  13 WESTERN ARIZONA. ML 3.1 (GS).

MAR 08
015214.6  51.070N 179.601E  33N 4.7     0.9  51 RAT ISLANDS, ALEUTIAN ISLANDS.
                                                ML 4.9 (PMR).
015913.1* 50.876N 179.717E  33N 4.7     1.1  15 RAT ISLANDS, ALEUTIAN ISLANDS.
                                                ML 4.7 (PMR).
052645.8? 34.56 S  70.53 W 120G         0.1  11 CHILE-ARGENTINA BORDER. MD 3.4
071035.5* 22.190S  68.409W 114D 4.9     1.0  31 NORTHERN CHILE
111148.6* 51.526N  16.085E  10G         0.4   6 POLAND. ML 3.9 (GRF), 3.9 (VIE)
140704.1* 82.349N  71.784W  10G 4.7     0.9  37 QUEEN ELIZABETH ISLANDS, CANADA
144910.2  34.371N 118.662W   5G         0.8  36 SOUTHERN CALIFORNIA. ML 3.0
        Felt in the northern part of the San Fernando Valley.
163001.0  50.753N 129.548W  10G 4.2     0.9  39 VANCOUVER ISLAND REGION
172225.4* 51.770N 176.705E  33N 4.3     1.1  10 RAT ISLANDS, ALEUTIAN ISLANDS.
                                                ML 4.6 (PMR).

MAR 09
070422.6  78.122N   1.101E  10G 5.3     0.8  51 GREENLAND SEA
081216.2& 19.340N 155.126W   5  3.9          36 HAWAII. <HVO-P>. MD 4.0 (HVO).
                                                Felt at Glenwood.

MAR 10
052223.3  46.052N 143.491E 363D 5.5     0.9  97 SAKHALIN ISLAND
070653.6  15.017N  92.750W  69D 4.6     0.9  34 MEXICO-GUATEMALA BORDER
072123.7  18.328S  69.035W  70G 4.9     0.8  49 NORTHERN CHILE
082237.7  11.565S 130.793W  10G 5.5 4.9 0.8  71 SOUTH PACIFIC OCEAN.

MAR 11
044956.9* 39.357N 142.182E  48D 4.8     0.9  19 NEAR EAST COAST OF HONSHU,
        JAPAN. Felt (III JMA) at Ofunato.
053916.5  31.251S  67.804W  33N 4.7     0.6  16 SAN JUAN PROVINCE, ARGENTINA
081552.4  36.981N  83.165W   5G 3.6     0.8  20 TENNESSEE. mbLg 3.8 (GS).
093643.6  38.867N 115.010W   5G         1.3  12 NEVADA. ML 3.3 (GS).
095004.7  36.996N  83.196W   5G         0.5   9 TENNESSEE. mbLg 3.3 (GS).
152110.2  43.929N 148.121E  33N 5.9 5.6 0.6 153 EAST OF KURIL ISLANDS. Mw 6.1

MAR 12
044046.0* 40.234N 143.493E  33N 4.7     0.8  16 OFF EAST COAST OF HONSHU, JAPAN
120943.7   5.305S 146.683E 231D 5.6     0.8  42 EASTERN NEW GUINEA REG., P.N.G.
143922.5  35.443N 140.780E  33N 4.9     1.0  22 NEAR EAST COAST OF HONSHU, JAPA

MAR 13
035431.4*  3.383S  80.533W  33N 4.6     0.7  18 PERU-ECUADOR BORDER
045134.7  44.634N 122.811W  10G         0.6  28 OREGON. MD 2.7 (SEA). Felt at
                                                Sweet Home.
103149.4*  2.835S 134.319E  33N 5.3 5.8 1.0  16 IRIAN JAYA REGION, INDONESIA. M
135032.1* 16.229S 173.460W  94D 5.0     0.8  24 TONGA ISLANDS

MAR 14
173350  Q 54.8  N 161.4  W  33N     5.9 1.2  81 ALASKA PENINSULA

Note:  Computer users can get faster acces to the Weekly Seismicity
Reports in any of three ways:
       1. World-Wide-Web (WWW) access:    http://quake.wr.usgs.gov
       2. Anonymous FTP access:           quake.wr.usgs.gov
                                          (in pub/www/QUAKES/WEEKREPS)
       3. Email Access:    (send email to michael@andreas.wr.usgs.gov)
Notes for Table 1:
       Origin time in the list is in GMT, in the text and on maps
       it is in local time.
       N RD: is the number of readings used to locate the event.
       N S: is the number of S waves in N RD.
       RMS SEC: is the root mean squared residual misfit for the
                location is seconds, the lower the better, over 0.3
                to 0.5 seconds is getting bad, but this is machine,
                not hand timed, data.
       ERH: is the estimated horizontal error in kilometers.
       ERZ: is the estimated vertical error in kilometers.
       N FM: is the number of readings used to compute the magnitude.
       REMKS: obtuse region codes that denote the velocity model
              used to locate the event.
       DUR MAG: is the magnitude as determined from the duration of
                the seismograms, not the amplitude.  Sort of like
                going to echo canyon and measuring how loud your
                yell is by counting echos.
       FIG: denotes the figure/event number in the maps posted separately.

                    ------------------------------------

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