diff --git a/ChangeLog b/ChangeLog
index 5f5fbc8..d7d125b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+2023.162:
+	- Update libmseed to 3.0.15 with fixes for v2 packing.
+
 2023.161:
 	- Update libmseed to 3.0.14
 	- Convert -EH option from header replacement to JSON Merge Patch
diff --git a/libmseed/ChangeLog b/libmseed/ChangeLog
index fb9d7f7..ed17cf1 100644
--- a/libmseed/ChangeLog
+++ b/libmseed/ChangeLog
@@ -1,3 +1,9 @@
+2023.162: 3.0.15
+	- Print sample rate in Hz consistently in msr3_print()
+	- Fix writing of SNR values field 9 of Blockette 201 (v2)
+	- Read and write microsecond offsets to/from Blockette 500 (v2)
+	- Fix addition of Clock Model field 9 of Blocketee 500 (v2)
+
 2023.160: 3.0.14
 	- Add FAQ to documentation and update example code to match API changes.
 	- Change sample type for text encoding to 't', value 'a' still supported.
diff --git a/libmseed/genutils.c b/libmseed/genutils.c
index 7d5939c..81bc1cd 100644
--- a/libmseed/genutils.c
+++ b/libmseed/genutils.c
@@ -863,7 +863,7 @@ ms_nstime2time (nstime_t nstime, uint16_t *year, uint16_t *yday,
 {
   struct tm tms;
   int64_t isec;
-  int ifract;
+  int32_t ifract;
 
   /* Reduce to Unix/POSIX epoch time and fractional seconds */
   isec   = MS_NSTIME2EPOCH (nstime);
@@ -876,8 +876,9 @@ ms_nstime2time (nstime_t nstime, uint16_t *year, uint16_t *yday,
     ifract = NSTMODULUS - (-ifract);
   }
 
-  if (!(ms_gmtime64_r (&isec, &tms)))
-    return -1;
+  if (year || yday || hour || min || sec)
+    if (!(ms_gmtime64_r (&isec, &tms)))
+      return -1;
 
   if (year)
     *year = tms.tm_year + 1900;
diff --git a/libmseed/libmseed.h b/libmseed/libmseed.h
index cc3d3af..5ebdb9c 100644
--- a/libmseed/libmseed.h
+++ b/libmseed/libmseed.h
@@ -28,8 +28,8 @@
 extern "C" {
 #endif
 
-#define LIBMSEED_VERSION "3.0.14"    //!< Library version
-#define LIBMSEED_RELEASE "2023.160"  //!< Library release date
+#define LIBMSEED_VERSION "3.0.15"    //!< Library version
+#define LIBMSEED_RELEASE "2023.162"  //!< Library release date
 
 /** @defgroup io-functions File and URL I/O */
 /** @defgroup miniseed-record Record Handling */
diff --git a/libmseed/msrutils.c b/libmseed/msrutils.c
index 317f87f..75147fd 100644
--- a/libmseed/msrutils.c
+++ b/libmseed/msrutils.c
@@ -295,7 +295,7 @@ msr3_print (MS3Record *msr, int8_t details)
   {
     ms_log (0, "%s, %d, %d, %" PRId64 " samples, %-.10g Hz, %s\n",
             msr->sid, msr->pubversion, msr->reclen,
-            msr->samplecnt, msr->samprate, time);
+            msr->samplecnt, msr3_sampratehz(msr), time);
   }
 } /* End of msr3_print() */
 
diff --git a/libmseed/pack.c b/libmseed/pack.c
index 427ffec..b92f5ff 100644
--- a/libmseed/pack.c
+++ b/libmseed/pack.c
@@ -1148,16 +1148,27 @@ msr3_pack_header2 (MS3Record *msr, char *record, uint32_t recbuflen, int8_t verb
 
       if ((ehval = yyjson_ptr_get (ehiterval, "/Time")) && yyjson_is_str (ehval))
       {
-        if (ms_timestr2btime (yyjson_get_str (ehval), (uint8_t *)pMS2B500_YEAR (record + written),
-                              msr->sid, swapflag) == -1)
+        uint32_t l_nsec;
+        uint16_t l_fsec;
+        int8_t l_msec_offset;
+
+        l_nsec = ms_timestr2btime (yyjson_get_str (ehval),
+                                   (uint8_t *)pMS2B500_YEAR (record + written),
+                                   msr->sid, swapflag);
+
+        if (l_nsec == -1)
         {
           ms_log (2, "%s: Cannot convert B500 time: %s\n", msr->sid, yyjson_get_str (ehval));
           yyjson_doc_free (ehdoc);
           return -1;
         }
-      }
 
-      *pMS2B500_MICROSECOND (record + written) = msec_offset;
+        /* Calculate time at fractional 100usec resolution and microsecond offset */
+        l_fsec        = l_nsec / 100000;
+        l_msec_offset = ((l_nsec / 1000) - (l_fsec * 100));
+
+        *pMS2B500_MICROSECOND (record + written) = l_msec_offset;
+      }
 
       if ((ehval = yyjson_ptr_get (ehiterval, "/ReceptionQuality")) && yyjson_is_num (ehval))
         *pMS2B500_RECEPTIONQUALITY (record + written) = (uint8_t)yyjson_get_num (ehval);
@@ -1168,7 +1179,7 @@ msr3_pack_header2 (MS3Record *msr, char *record, uint32_t recbuflen, int8_t verb
       if ((ehval = yyjson_ptr_get (ehiterval, "/Type")) && yyjson_is_str (ehval))
         ms_strncpopen (pMS2B500_EXCEPTIONTYPE (record + written), yyjson_get_str (ehval), 16);
 
-      if ((ehval = yyjson_ptr_get (ehiterval, "/FDSN/Clock/Model")) && yyjson_is_str (ehval))
+      if ((ehval = yyjson_ptr_get (ehroot, "/FDSN/Clock/Model")) && yyjson_is_str (ehval))
         ms_strncpopen (pMS2B500_CLOCKMODEL (record + written), yyjson_get_str (ehval), 32);
 
       if ((ehval = yyjson_ptr_get (ehiterval, "/ClockStatus")) && yyjson_is_str (ehval))
@@ -1190,7 +1201,7 @@ msr3_pack_header2 (MS3Record *msr, char *record, uint32_t recbuflen, int8_t verb
 
       /* Determine which detection type: MURDOCK versus the generic type */
       if ((ehval = yyjson_ptr_get (ehiterval, "/Type")) && yyjson_is_str (ehval) &&
-          strncasecmp (yyjson_get_str (ehval), "MURDOCK", 6) == 0)
+          strncasecmp (yyjson_get_str (ehval), "MURDOCK", 7) == 0)
       {
         blockette_type = 201;
         blockette_length = 60;
@@ -1265,7 +1276,7 @@ msr3_pack_header2 (MS3Record *msr, char *record, uint32_t recbuflen, int8_t verb
         yyjson_val *ehsubiterval;
         int idx = 0;
 
-        if ((ehsubarr = yyjson_ptr_get (ehiterval, "/MEDSNR")) && yyjson_is_arr (ehval))
+        if ((ehsubarr = yyjson_ptr_get (ehiterval, "/MEDSNR")) && yyjson_is_arr (ehsubarr))
         {
           yyjson_arr_iter_init (ehsubarr, &ehsubiter);
 
diff --git a/libmseed/unpack.c b/libmseed/unpack.c
index c6f09b2..565a645 100644
--- a/libmseed/unpack.c
+++ b/libmseed/unpack.c
@@ -796,7 +796,12 @@ msr3_unpack_mseed2 (char *record, int reclen, MS3Record **ppmsr,
       if (exception.time == NSTERROR)
         return MS_GENERROR;
 
-      exception.usec = *pMS2B500_MICROSECOND (record + blkt_offset);
+      /* Apply microsecond precision if non-zero */
+      if (*pMS2B500_MICROSECOND (record + blkt_offset) != 0)
+      {
+        exception.time += (nstime_t)*pMS2B500_MICROSECOND (record + blkt_offset) * (NSTMODULUS / 1000000);
+      }
+
       exception.receptionquality = *pMS2B500_RECEPTIONQUALITY (record + blkt_offset);
       exception.count = HO4u (*pMS2B500_EXCEPTIONCOUNT (record + blkt_offset), msr->swapflag);
       ms_strncpcleantail (exception.type, pMS2B500_EXCEPTIONTYPE (record + blkt_offset), 16);
@@ -849,6 +854,7 @@ msr3_unpack_mseed2 (char *record, int reclen, MS3Record **ppmsr,
 
         msr->extralength = length;
       }
+      /* Otherwise add it to existing headers */
       else
       {
         ival = *pMS2B1001_TIMINGQUALITY (record + blkt_offset);
@@ -897,13 +903,10 @@ msr3_unpack_mseed2 (char *record, int reclen, MS3Record **ppmsr,
     mseh_free_parsestate (&parsestate);
   }
 
-  /* Check for a Blockette 1000 */
-  if (B1000offset == 0)
+  /* Check for a Blockette 1000 and log warning if not found */
+  if (B1000offset == 0 && verbose > 1)
   {
-    if (verbose > 1)
-    {
-      ms_log (1, "%s: Warning: No Blockette 1000 found\n", msr->sid);
-    }
+    ms_log (1, "%s: Warning: No Blockette 1000 found\n", msr->sid);
   }
 
   /* Check that the data offset is after the blockette chain */